Earthquake Bridge: Soaring 40 stories high, and spanning 2.2 miles of water, San Francisco’s new Bay Bridge is one of the most earthquake-proof bridges in the world. And it has to be. Built between the two most active earthquake faults in America it is under constant attack from Planet Earth. To keep San Francisco’s Life-line standing, even when the Big One hits, engineers have packed it full of innovative quake technology: some of the largest shock absorbers in the world, foundations you’d normally find on an oil-rig, and a radical cable design that makes this the largest Self Anchored Suspension Bridge in the world.