A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

For those going through a life transition, a place to leave behind a piece of your former self.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

A reproduction of earth's many biomes.

This massive metal sculpture in the shape of a folded paper airplane overlooks a Utah mountain.

The telescope that discovered Neptune.

The scars of World War II are preserved on its walls.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A miniature city, once ruled by the Queen of the Netherlands.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

A beautiful maze marks where three countries meet.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

Legendary site where an evil bishop was devoured by rodents.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

A beautifully eclectic mix of architectural styles.

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