A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

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

A unique waterfall that some believe attracts the fairfolk.

The famous Alice Liddell designed this memorial after losing her sons in World War I.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

A historic house left in "dramatic still life."

The Hveragerði fissure runs through this unassuming shopping center.

Finding the exact middle of a giant land mass is hard to determine, but this spot managed to do the trick.

This pioneer village is like a time capsule of 19th-century Australia.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

Once the path of a railway tunnel, now home to thousands of glowing insects.

Australian Lake set aglow by Noctiluca Scintillans.

The stunningly blue waters of these beautiful caves also have a violent past.

In the Hugging Tree Forest, lingonberry marshmallows, hot chocolates, and the best campfire lattes north of the Arctic Circle come to you.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

400-year-old garden, restored to beauty.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This century-old cinema is complete with musical interludes and boasts a rare projection system.