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

The curious underground history of keeping Paris clean.

France's most famous cemetery, with some of its most curious tombs.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

A giant open-air sculpture made of over 200 full-sized boats.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Robots, lasers, and whoopee cushions, oh my!

This striking art museum holds an amazing series of curiosity cabinets.

A house and yard adorned with bizarre concrete sculptures in a Milwaukee suburb.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

One of the shortest streets in York has an especially odd name.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

There’s a hidden military meme engraved on the World War II Memorial.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The world's longest known cave system.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

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

A museum and shop on Bourbon Street located in the French Quarter.