This is the largest gantry crane in the world.

It's 730 feet long--longer than AT&T baseball stadium, taller than the Statue of Liberty, and weighs as much as the Eiffel Tower. Built to swap gun turrets on battleships, the crane can lift over a million pounds.

The naval yard was decommissioned in the early 1970's, and the crane has loomed over San Francisco's skyline since.