A quaint Russian village in the middle of a German metropolis.

This historic franken-chapel is the oldest wooden church in the world, at least part of it.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A bizarre house filled with an astounding array of collections.

Peek through a transparent pyramid and drink in the mountain made of books.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

It's always game time at Stockholm's only museum devoted solely to video games.

A competition inspired by Stephen King's psychological horror novel "The Long Walk."

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

"There's nothing there," and other lies the KGB told us.

A curious collection of mechanical moving figures.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

These skilfully executed, poignant works of art dot a verdant Scottish dell.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

This tiny island is home to the world's largest colony of Northern gannets.

Every New Year's Day, locals don gaudy costumes and dive into the frigid Firth of Forth.