A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

This expansive bridge in the Canadian wilderness was originally just built for friends.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Natural time capsule containing an alien ecosystem.

A fantastic castle rumored to be the birthplace of King Arthur.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A fifth-century temple improbably built into the side of a cliff.

Renaissance villa and gardens complete with a tormented colossus.

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

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

An ethereal glowing blue ocean cave in Croatia.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A spectacular cave and a beguiling lake.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A beautiful geyser under environmental threat.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Rising from the sea like a stone monster.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.