lost/hidden underground structures
http://www.theverge.com/2014/2/5/528...-avenue-subway -- Atlantic Avenue abandoned subway tunnel in Brooklyn. 2570-ft long.
http://www.nycgo.com/slideshows/new-york-secrets/11/ Brooklyn Bridge (Manhattan side) Bomb shelter and hidden chambers--restocked by the folks who brought you the Strategic Reserve stockpile(s) of Allegheny Uprising? 
http://www.nycgo.com/slideshows/new-york-secrets/2/ -- "Lost Station" subway stop under NYC City Hall, something one of the Duke's opponents might pay well to learn of.
http://gizmodo.com/how-one-inventor-...nde-1123695775 Mr. Beach's Pneumatic Subway, on Manhattan Island.
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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