Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

A darkly erotic open-air statuary in Catalonia.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Tucked in the back of this amazing antique store is an important piece of medical history.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A terrific purveyor of natural history objects and curios.

Every year, the town of Menton, France, turns lemons and oranges into giant sculptures depicting windmills, dragons, and more.

An eerie, derelict amusement park in Berlin.

Abstract dinosaur models in London.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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

A Spanish forest is filled with mysterious stone carvings.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Turntable anonymously received orphans, alms, and groceries.