Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This Scottish graveyard is the final resting place of the man who inspired the character Ebenezer Scrooge.

This stately bank building hides a spectacular star-studded ceiling.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

A former telephone box found new life as a photo booth and charity fundraiser.

One of Edinburgh's most popular works of street art is located well off the beaten path.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

"World machine" built by an untrained Austrian farmer.

A crazy maze of a hostel, where every trap door and secret entrance brings you to a new wacky, wonderful room.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Ride a dragon train into a world of dwarves.

The beautiful baroque library of the Hapsburg empire.

Fantastic stories on a miniature railroad.