NOVA Riddles of the Sphinx53:07Video duration: 53:07 Aired: 01/18/10 Expires: 12/15/15Rating: TV-GVideo has closed captioning. A marvel of ancient engineering is vanishing. Can it be saved? Add to WatchlistBuy this Video:Buy this video on iTunesBuy DVDShare:Share this video on FacebookShare this video on TwitterShare this video via EmailShare this video on Google PlusEmbed Code for this videoEmbed Code×CloseNOVARiddles of the SphinxPremiere Date: Jan. 18, 2010, 11:01 p.m.Width in pixels px Height in pixels px Please copy this text to your clipboardProblems Playing Video ?Report a problemClosed CaptioningReport a Problem×CloseBefore 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.CloseEpisode LinksNOVA's Riddles of the Sphinx homepageLinks & BooksTranscript Funding for NOVA is provided by David H. Koch, the Corporation for Public Broadcasting and PBS viewers.