I assume all buildibgs I enter are properly engineered, but sometimes they're not. Two cases that come to mind: https://en.wikipedia.org/wiki/Hyatt_Regency_wa

I assume all buildibgs I enter are properly engineered, but sometimes they're not. Two cases that come to mind: https://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse https://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse http://www.slate.com/blogs/the_eye/2014/04/17/the_citicorp_tower_design_flaw_that_could_have_wiped_out_the_skyscraper.html http://www.slate.com/blogs/the_eye/2014/04/17/the_citicorp_t... Both were essentially caused by people making assumptions. You would think such things would be thought through, but sometimes they're not.