{"id":1540,"date":"2026-08-13T11:46:14","date_gmt":"2026-08-13T10:46:14","guid":{"rendered":"https:\/\/viasathistory.eu\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/"},"modified":"2026-08-13T11:55:47","modified_gmt":"2026-08-13T10:55:47","slug":"cities-of-the-underworld-s4e4-americas-secret-underground","status":"publish","type":"vsei_episode","link":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/","title":{"rendered":"Ora\u0219ele din Lumea de Jos \u2014 Sezonul 4, Episodul 4 \u2014 Lumea subteran\u0103 secret\u0103 a Americii"},"content":{"rendered":"<div class=\"vsei-meta\"><span><b>Serie:<\/b> <a href=\"https:\/\/viasathistory.eu\/ro\/seriale\/orase-subterane\/\">Ora\u0219ele lumii subterane<\/a><\/span><span><b>Sezonul:<\/b> 4<\/span><span><b>Episod:<\/b> 4<\/span><span><b>Anul de produc\u021bie:<\/b> 2020<\/span><\/div>\n<h2>Sinopsis<\/h2>\n<p>Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.<\/p>\n<h3>Despre serie<\/h3>\n<p>Don Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to the ends of the Earth travelling to history&#039;s most ancient places.<\/p>","protected":false},"excerpt":{"rendered":"<p>Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020 Synopsis Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet. About the series Don Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep [&hellip;]<\/p>\n","protected":false},"featured_media":1533,"template":"","meta":[],"vsei_genre":[64,16,27,17],"class_list":["post-1540","vsei_episode","type-vsei_episode","status-publish","has-post-thumbnail","hentry","vsei_genre-adventure","vsei_genre-documentary","vsei_genre-expedition","vsei_genre-history"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO Pro (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"ro_RO\" \/>\n\t\t<meta property=\"og:site_name\" content=\"viasathistory.eu -\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu\" \/>\n\t\t<meta property=\"og:description\" content=\"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png\" \/>\n\t\t<meta property=\"og:image:width\" content=\"512\" \/>\n\t\t<meta property=\"og:image:height\" content=\"512\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-08-13T10:46:14+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-08-13T10:55:47+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/viasathistory.eu\\\/ro\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/genre\\\/documentary\\\/#listItem\",\"name\":\"Documentary\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/genre\\\/documentary\\\/#listItem\",\"position\":2,\"name\":\"Documentary\",\"item\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/genre\\\/documentary\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#listItem\",\"name\":\"Cities of the Underworld \\u2014 S4E4 \\u2014 America&#8217;s Secret Underground\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#listItem\",\"position\":3,\"name\":\"Cities of the Underworld \\u2014 S4E4 \\u2014 America&#8217;s Secret Underground\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/genre\\\/documentary\\\/#listItem\",\"name\":\"Documentary\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/#organization\",\"name\":\"Viasat History | Great Civilisations, War &amp; Hidden History\",\"description\":\"Explore great civilisations, wars, and hidden history with premium documentaries on Viasat History \\u2014 the greatest moments of our past, reimagined.\",\"url\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#webpage\",\"url\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/\",\"name\":\"Cities of the Underworld \\u2014 S4E4 \\u2014 America\\u2019s Secret Underground - viasathistory.eu\",\"description\":\"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to\",\"inLanguage\":\"ro-RO\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#breadcrumblist\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/viasathistory.eu\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/cropped-2907c362-917d-4677-8cff-a368b2712223-Cities-Of-The-Underworld-S04.jpg\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#mainImage\",\"width\":1920,\"height\":800},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/episode\\\/cities-of-the-underworld-s4e4-americas-secret-underground\\\/#mainImage\"},\"datePublished\":\"2026-08-13T11:46:14+01:00\",\"dateModified\":\"2026-08-13T11:55:47+01:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/#website\",\"url\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/\",\"name\":\"viasathistory.eu\",\"inLanguage\":\"ro-RO\",\"publisher\":{\"@id\":\"https:\\\/\\\/viasathistory.eu\\\/ro\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO Pro -->\r\n\t\t<title>Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu<\/title>\n\n","aioseo_head_json":{"title":"Ora\u0219ele lumii subterane \u2014 Sezonul 4, Episodul 4 \u2014 Lumea subteran\u0103 secret\u0103 a Americii - viasathistory.eu","description":"Serial: Ora\u0219ele din lumea subteran\u0103 Sezonul: 4 Episodul: 4 Anul de produc\u021bie: 2020 Rezumat: Don exploreaz\u0103 tuneluri militare \u0219i guvernamentale strict secrete \u0219i analizeaz\u0103 tehnologii clasificate care ar putea fi folosite pentru a construi ora\u0219e \u00eentregi chiar sub picioarele noastre.Despre serie: Don Wildman \u00eencearc\u0103 s\u0103 arunce o nou\u0103 lumin\u0103 asupra celor mai enigmatice mistere ale trecutului nostru \u0219i cerceteaz\u0103 \u00een profunzime pe parcursul c\u0103l\u0103toriei sale c\u0103tre","canonical_url":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro#listItem","position":1,"name":"Home","item":"https:\/\/viasathistory.eu\/ro","nextItem":{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/#listItem","name":"Documentary"}},{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/#listItem","position":2,"name":"Documentary","item":"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/","nextItem":{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#listItem","name":"Cities of the Underworld \u2014 S4E4 \u2014 America&#8217;s Secret Underground"},"previousItem":{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#listItem","position":3,"name":"Cities of the Underworld \u2014 S4E4 \u2014 America&#8217;s Secret Underground","previousItem":{"@type":"ListItem","@id":"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/#listItem","name":"Documentary"}}]},{"@type":"Organization","@id":"https:\/\/viasathistory.eu\/ro\/#organization","name":"Viasat History | Great Civilisations, War &amp; Hidden History","description":"Explore great civilisations, wars, and hidden history with premium documentaries on Viasat History \u2014 the greatest moments of our past, reimagined.","url":"https:\/\/viasathistory.eu\/ro\/"},{"@type":"WebPage","@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#webpage","url":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/","name":"Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu","description":"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to","inLanguage":"ro-RO","isPartOf":{"@id":"https:\/\/viasathistory.eu\/ro\/#website"},"breadcrumb":{"@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#breadcrumblist"},"image":{"@type":"ImageObject","url":"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/08\/cropped-2907c362-917d-4677-8cff-a368b2712223-Cities-Of-The-Underworld-S04.jpg","@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#mainImage","width":1920,"height":800},"primaryImageOfPage":{"@id":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/#mainImage"},"datePublished":"2026-08-13T11:46:14+01:00","dateModified":"2026-08-13T11:55:47+01:00"},{"@type":"WebSite","@id":"https:\/\/viasathistory.eu\/ro\/#website","url":"https:\/\/viasathistory.eu\/ro\/","name":"viasathistory.eu","inLanguage":"ro-RO","publisher":{"@id":"https:\/\/viasathistory.eu\/ro\/#organization"}}]},"og:locale":"ro_RO","og:site_name":"viasathistory.eu -","og:type":"article","og:title":"Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu","og:description":"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to","og:url":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/","og:image":"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png","og:image:secure_url":"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png","og:image:width":512,"og:image:height":512,"article:published_time":"2026-08-13T10:46:14+00:00","article:modified_time":"2026-08-13T10:55:47+00:00","twitter:card":"summary_large_image","twitter:title":"Cities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground - viasathistory.eu","twitter:description":"Series: Cities of the UnderworldSeason: 4Episode: 4Production year: 2020SynopsisDon explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities right under our feet.About the seriesDon Wildman attempt to shine new light on the most vexing mysteries of our past and delves deep as he journeys to","twitter:image":"https:\/\/viasathistory.eu\/wp-content\/uploads\/2026\/05\/cropped-Viasat_History_Favicon.png"},"aioseo_meta_data":{"post_id":"1540","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_custom_url":null,"og_image_custom_fields":null,"og_image_url":null,"og_image_width":null,"og_image_height":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_image_url":null,"twitter_title":null,"twitter_description":null,"schema_type":"default","schema_type_options":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":"2026-08-19 15:16:20","created":"2026-08-13 10:46:14","updated":"2026-08-19 15:16:20","reviewed_by":null,"focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/viasathistory.eu\/ro\" title=\"Home\">Home<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/\" title=\"Documentary\">Documentary<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\tCities of the Underworld \u2014 S4E4 \u2014 America\u2019s Secret Underground\n<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/viasathistory.eu\/ro"},{"label":"Documentary","link":"https:\/\/viasathistory.eu\/ro\/genre\/documentary\/"},{"label":"Cities of the Underworld \u2014 S4E4 \u2014 America&#8217;s Secret Underground","link":"https:\/\/viasathistory.eu\/ro\/episode\/cities-of-the-underworld-s4e4-americas-secret-underground\/"}],"_links":{"self":[{"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/vsei_episode\/1540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/vsei_episode"}],"about":[{"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/types\/vsei_episode"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/media\/1533"}],"wp:attachment":[{"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/media?parent=1540"}],"wp:term":[{"taxonomy":"vsei_genre","embeddable":true,"href":"https:\/\/viasathistory.eu\/ro\/wp-json\/wp\/v2\/vsei_genre?post=1540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}