INTERACTIVE: See before and after photos of Florida condo building collapse

Wood Roof Trusses: Analyzing Collapse - Building Construction and Fire

When buildings fail: An engineer explains how to prevent America's aging buildings from collapse

Photographer Richard Drew's "Falling Man"

Footage of bodies of those who jumped/fell from the WTC during 9/11. Before the Towers collapsed, an estimated 200 people fell to their deaths from the burning towers, at a speed of almost 150 mph—sufficient to cause instant death, but insufficient to cause unconsciousness during the fall (GRAPHIC)