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

This artistic fountain display pays homage to this area's theatrical history.

The tallest mountain in mainland Netherlands isn't actually very tall.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

Started as a kitchen garden, now the second largest botanical garden in the world.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

Look closely, and you'll see this rusty man is crying.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Elevated freight railway turned wildly successful urban park.

This elaborate towering structure was once famed for its revolutionary height.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

An overlooked memorial honoring the local Washington residents who died in World War I.