This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

Large Hadron Collider and the Birthplace of World Wide Web.

The site of Austria's biggest concentration camp now honors its victims.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

This outsider art house has gone from clinical creation to astounding artwork.

Museum devoted to the artificial language of Esperanto.

This one-time health resort was used by aristocrats around the world.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A monument to the love people have for their pets.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Its buzzing collection honors vibrator history.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

A huge musical instrument played by the ocean.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A cableway for car transport.

Be it nature, art, or abandoned military architecture this eclectic German "museum" has you covered.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The first museum in the world devoted to sexual gadgetry.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

In this century-old literary safehouse, print is alive and well.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The final resting place of many of Germany's most famous communists.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.