A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The most impressive of Basel's three remaining city gates.

Everything from alchemy books to building plans for the Eiffel Tower are housed inside this museum.

This medieval footbridge in the Swiss Alps is known to attract cliff-jumping daredevils.

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

The World Wide Web was created in this nondescript corridor at CERN.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

Enormous, fluffy dogs frolic around this museum dedicated to a legendary Saint Bernard.

This crescent-shaped beach is said to glow under the light of a full moon.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

Site of a former hidden treehouse in New Orleans.

This Birdsill Holly fire hydrant is the remnant of a very different type of hydration innovation.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

A house of courtship where the Jazz Age's most storied lovers got their start.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

The only place to see live frogs don pigtails and top hats, then eat their scrumptious legs.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.