A huge musical instrument played by the ocean.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

Version of the French Riviera destroyed by the sea.

A hand-built folk art installation covered with messages of God's love.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

An off-grid art installation that encourages its visitors to imagine a world without waste.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

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

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

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A musical instrument played by the sea.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

When you've got to go, you've got to go.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.