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

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

The tower in this 1,000-year-old mud-brick village seems to vibrate for no apparent reason.

Every year locals tumble 650 feet down to the bottom of the hill chasing a Double Gloucester cheese.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

To enter the lower hall of this temple, you must first walk through a dragon.

Japan's largest area of "pink moss" turns the hillside bright pink every spring.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

The world's first hotel built in an abandoned water-filled quarry.

Follow the original medieval paths that wind through this intriguing section of the city.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

Explore the quarry where the marble was sourced for Michaelangelo's David.

At high tide this strange footbridge appears to have no purpose whatsoever.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

A Japanese cat island also populated by the descendants of a band of banished samurai.

Hidden in the shadow of a rocky fortress is one concubine’s long-forgotten legacy.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

The water here is so clear you can see the mysteriously sunken ship from the surface.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

An ancient Viking village in North America that predates Columbus by 500 years.