Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Aliens and monsters lurk inside this museum dedicated to one man's lifelong adoration of all things sci-fi.

These giant sculptures are supported by a bizarre menagerie of feet.

This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

England's "pier at the end of the universe" unites astronomy and contemporary architecture.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

The most alien-looking place on Earth.

A series of five defunct panopticon prisons in Cuba.

This tiny little island has, as the name says, just enough room for its single house.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Natural cathedral designed by Italian artist Giuliano Mauri.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The central mosque of this Mali town is entirely built from mud.