This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An eerie, derelict amusement park in Berlin.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

Iceland's tribute to its thankless civil servants.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

These enlarged egg sculptures represent the native birds of eastern Iceland.

This stunning concert hall has become a symbol of Iceland's national recovery.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Three columns of volcanic rock shoot out of the ocean.

This fairytale-like structure is the last turf church ever constructed in Iceland.

The largest whale museum in Europe allows visitors to walk among life-size giants.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.