The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's second-largest sundial, made entirely out of stone.

Macabre astrological automaton clock dating to the late 1400s.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.