This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

The most loyal of little dogs, or a Victorian era publicity stunt?

Portugal's National Pantheon has a history of curses, collapses and financial problems.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The curios of pharmacist and collector Henry Wellcome.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

A hotel with a rich Wild West history of miners and bootleggers.

Two New York rooftops are home to the largest rooftop soil farms in the world.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A stupa built to protect Bhutan from evil forces and help bring peace to the world.

This colorful overpass is one of Bhutan's longest suspension bridges.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

This former iron ore mine comes alive with fascinating stories of its history.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

This once-derelict building is now one of the most beautiful bookstores in the world.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.