Torre Ejecutiva Pemex Explosion

http://en.wikipedia.org/wiki/2013_Pemex_explosion

http://www.hazardexonthenet.net/article/55896/Fatal-explosion-and-fire-devastates-Pemex-HQ-in-Mexico-City.aspx?AreaID=2

http://www.guardian.co.uk/world/2013/jan/31/mexico-americas

http://www.reuters.com/article/2013/02/01/us-mexico-pemex-idUSBRE90U1FF20130201

http://www.bbc.co.uk/news/world-latin-america-21288214,
http://www.infopig.com/keywords/explosion.html

http://www.euronews.com/2013/02/01/casualties-expected-to-rise-in-fatal-mexico-city-tower-explosion

http://en.wikipedia.org/wiki/Torre_Ejecutiva_Pemex:
http://skyscraperpage.com/diagrams/?countryID=23

http://en.wikipedia.org/wiki/Category:Disasters_in_Mexico, 
http://www.bbc.co.uk/news/world-latin-america-18170525

Singapore

http://en.wikipedia.org/wiki/Singapore

http://www.cnbc.com/id/100418370

http://www.ft.com/cms/s/0/a5d2179a-6532-11e2-a3db-00144feab49a.html#axzz2JxGC45MA

Urban Disasters

http://en.wikipedia.org/wiki/Surviving_Urban_Disasters

http://disastersurvingtips.blogspot.ca/2012/06/surviving-urban-disasters-do-you-know.html

http://urbansurvivalsite.com, http://www.urbansurvival.com & http://www.urbansurvival.com/blog,
http://lifehacker.com/5889600/macgyver-survivalist-or-stockpiler-the-urban-survival-skills-everyone-needs-to-know

http://blogs.cfr.org/patrick/2012/08/14/man-made-cities-and-natural-disasters-the-growing-threat

http://www.unisdr.org/we/inform/publications/11000, http://www.planetizen.com/node/37045

http://www.springer.com/law/environmental/book/978-3-642-29469-3

http://www.infowars.com/hurricane-aerosol-and-microphysics-program-the-dhs-research-project-on-hurricane-modification

http://jfdatalinks.blogspot.ca/2013/02/new-orleans-and-superdome.html

The Montreal Flood

http://news.ca.msn.com/canada/cause-of-montreal-flood-old-pipes-city-says

Greatest Cities In Human History

http://www.businessinsider.com/largest-cities-throughout-history-2013-1?utm_source=msnca&utm_medium=referral&utm_term=&utm_content=122&utm_campaign=partner#

http://aerialarchives.photoshelter.com/search?I_DSC=aerial%20photograph%20Mark%20Hopkins%20hotel&_ACT=search&I_DSC_AND=t

Notre Dame de Paris

https://en.wikipedia.org/wiki/Notre-Dame_de_Paris

https://www.notredamedeparis.fr/en

https://www.britannica.com/topic/Notre-Dame-de-Paris

https://www.friendsofnotredamedeparis.org/notre-dame-cathedral/

https://en.wikipedia.org/wiki/Notre-Dame_de_Paris#History

https://jfdatalinks.blogspot.com/search?q=Notre-Dame+de+Paris  

Basilique Notre-Dame de Montréal

"The church is located at 110 Notre-Dame Street West..." 
http://en.wikipedia.org/wiki/Notre-Dame_Basilica_(Montreal)

"The cornerstone was laid at Place d"Armes on September 1, 1824." 
http://en.wikipedia.org/wiki/Notre-Dame_Basilica_(Montreal)#History, 
http://www.flickr.com/photos/55062215@N05/6668502933 

http://jfdatalinks.blogspot.ca/2012/12/notre-dame-de-paris.html

Calgary, Denver and Dallas

Calgary can get as cold, or even colder than Denver at times. However, Calgary can get almost as hot as Dallas during the summer.

"...the Denver City Town Co. was organized on Nov. 22, 1858..." 
http://www.denverpost.com/denver150/ci_11027566

http://en.wikipedia.org/wiki/Denver#History, http://en.wikipedia.org/wiki/William_Larimer,_Jr.

http://en.wikipedia.org/wiki/Auraria,_Denver

http://www.coloradodirectory.com/maps/denver.html

http://doubtfulnews.com/2011/12/conspiracies-abound-at-the-denver-airport-and-all-around

http://doubtfulnews.com/2013/02/remarkable-but-bizarre-icon-in-denver-at-risk/

https://jfdatalinks.blogspot.com/search?q=Denver

android-phones-vs-the-iphone

http://www.techrepublic.com/blog/10things/10-things-android-phones-do-better-than-the-iphone/1131

York England and New York USA

The City of York & New_York_City:
http://en.wikipedia.org/wiki/York_Minster,
http://en.wikipedia.org/wiki/York_Minster#Architecture_of_the_present_building,
http://en.wikipedia.org/wiki/York_city_walls,
http://www.sacred-texts.com/nos/091101.htm
Both the old York & the New York would become known for their twin towers.
http://en.wikipedia.org/wiki/Lower_Manhattan

http://en.wikipedia.org/wiki/Statue_of_Liberty#Construction_in_France