The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

France's national museum of scientific and industrial instruments.

An encyclopedic collection of mammal penises.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Historic medieval fortified city in southwest France.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Incredible labyrinth of man made caves.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

A garden of flying flowers.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Beasts and branches swirl in sandstone carvings, interrupted by one strange creature.

Rare collection of medieval books under lock and key.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

The oldest church in Iceland is one of the few to feature ornate decoration.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This elegant arc of a waterfall marks a religious turning point.

"Alleys of Stone" form natural mazes in Spanish natural park.