Please expand and complete the following lists:

http://en.wikipedia.org/wiki/Radio_masts_and_towers_-_catastrophic_collapses (catastrophic collapses of radio towers)

http://en.wikipedia.org/wiki/Bridge#Catastrophic_collapses (catastrophic collapses of bridges)

List of deadliest natural disasters (http://en.wikipedia.org/wiki/Worst_natural_disasters)