A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The stunning interior of this Gothic church is covered in ornate gold details.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Obelisks and stone pineapples in the Irish countryside.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

Willy Wonka would love this weird half-a-home.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An architect's childhood fantasy treehouse made real.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

Real bones which are said to have belonged to a Polish dragon.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Morocco's Argania trees are infested with nut-hungry goats.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

The most alien-looking place on Earth.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.