1 WTC 1973 and 2013

http://www.skyscrapercity.com/showthread.php?t=419362&page=1957

http://en.wikipedia.org/wiki/One_World_Trade_Center, http://onewtc.com,
http://ca.news.yahoo.com/last-pieces-1-world-trade-center-rising-skyscraper-064129435.html,
http://www.wtc.com/media/images/s/wtc-construction-1-world-trade-center

http://www.flickr.com/photos/crim/7638329258/

http://www.skyscrapercity.com/showthread.php?p=84125976,
http://www.skyscrapercity.com/showthread.php?t=419362&page=1224,
http://www.skyscrapercity.com/showthread.php?t=419362&page=1280

http://www.theconstructionindex.co.uk/news/view/world-sees-slow-down-in-completions-of-200m-plus-towers

http://en.wikipedia.org/wiki/Antoni_Gaud%C3%AD#Quest_for_a_new_architectural_language,  http://www.skyscrapercity.com/showthread.php?t=419362&page=2104,
http://www.biography.com/people/antoni-gaud%C3%AD-40695

Big Data Search

http://www.wired.com/dangerroom/2013/04/boston-data-manhunt

Subterranean Buildings and things

http://money.ca.msn.com/savings-debt/gallery/subterranean-spaces-of-the-superrich-1

http://jfdatalinks.blogspot.ca/2013/04/the-chicago-tunnel-company.html

The Chicago Tunnel Company

Chicago_Tunnel_Company#History,

http://users.ameritech.net/chicagotunnel/tunnel1.html,

http://www.irm.org/railwire/rw162a1.html,

http://fdelaitre.club.fr/Chicago.htm#TIME,

http://fdelaitre.club.fr/index.html

-

http://www.youtube.com/watch?v=Cvl9jIhMk-w&feature=related

http://jfdatalinks.blogspot.ca/2010/11/living-in-tunnels.html

Aqua Tower, Chicago

http://www.wired.com/design/2013/01/building-of-the-week/#slideid-148103

http://www.wired.com/design/2013/01/building-of-the-week

http://jfdatalinks.blogspot.ca/2013/04/the-chicago-tunnel-company.html

Vancouver-airport-outlet-mall

http://www.vancitybuzz.com/2013/03/vancouver-airport-outlet-mall