A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Sleep in a climate-controlled plastic bubble for the night.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Notorious artist squat renovated into legal studios.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

This historic little railroad runs through some of the most beautiful scenery in Germany.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A fearsome dragon clings to a corner of Munich's city hall.

Legendary site where an evil bishop was devoured by rodents.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The fairy tale castle of the "fairy-tale king."

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

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

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.