Only two of these trees remain in the natural world, found high in the cloud forest of the island of Mauritius.

Giant disc-shaped gate took 20 men to close off this city in Madagascar.

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

The runoff from these fiery cliffs sends red water flowing into the sea.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

Along the banks of the River Rhine lies a park that seems unassuming, but beneath the surface lies a long and fascinating history.

A famed artist's inspiring work of peace and tolerance.

The largest mosque in Germany.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

How did a lighthouse wind up in the middle of this landlocked German city?

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

An industrial relic is now one of Europe's most staggering art spaces.

This former steel and coal plant is now a neon-lit industrial fantasia.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

Take a walk in a recreation of ancient Rome.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Carved fountains poignantly placed in parks and in front of special monuments.

Fantastic views and thousands of love locks.

A rare chance to ride one of the few continuous elevators still in operation.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.