Ancient Invisible CitiesAthens' Hidden City Walls Clip: Season 1 | 1m 51s Inside a modern multi-story parking lot in the center of Athens is a remarkable section of Athens’ city walls, built in the early 5th century BC. Aired: 08/29/18 Rating: TV-PG Closed CaptioningVideo has closed captioning.checkmarkAdd to WatchlistProblems Playing Video?Report a ProblemClosed CaptioningShare:Share this video on FacebookFacebookShare this video on TwitterTwitterShare this video on Google PlusGoogleShare this video via EmailE-mailEmbedEmbed Code for this videoEmbed CodeAncient Invisible CitiesAthens' Hidden City WallsSeason 1 Episode Width in pixels px Height in pixels px Copied to your clipboardLabelCopy to ClipboardClick to copy embed code for videoCloseCloseReport a ProblemBefore you submit an error, please consult our Troubleshooting Guide.Type of ErrorVideo doesn't loadVideo loads, but doesn't playVideo jumps back/forwardOnly audio is streamingSponsorship playback errorOtherPlease add more detailsCancelSubmit ReportYour report has been successfully submitted. Thank you for helping us improve PBS Video.CloseCloseClose