Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Ask nicely, and stewards of a centuries-old charitable tradition will give you free bread and beer.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A tiny, remote island packed with wonders both natural and geeky.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

This Central New York ghost town was once a prosperous railroad community.

The southernmost outpost of the Russian Empire in colonial America.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A market built atop boats is one of the few floating holiday markets in Europe.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This dramatic rail curve was once the target of a failed Nazi attack.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

Legend has it fairies gathered at the site of this medieval castle.

A remarkably well preserved tower dating all the way back to the Iron Age.

These ancient sea caves hold Britain's highest concentration of Pictish rock carvings.