This small, ingenious cannon once helped regulate Parisian life.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This cheese shop also houses a museum devoted to Dutch dairy.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An architectural oddity hides in plain sight on this iconic London bridge.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Elevated freight railway turned wildly successful urban park.

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

Less a museum than a bizarre fantasy world created by artists and engineers.

In Houston's airport, a cow is properly equipped to jump over the moon.

This unconventional used book store was once in the news for the surprising act of burning books.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.