This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This Costa Rican topiary park is a surreal garden of unearthly delights.

These fantastically named natural pools look like something out of a Scottish myth.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Part bookstore, part café, and part forest.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

Drink and dine in a coral cave that's at least 120,000 years old.

Swim or sail to this pie-slinging boat off the coast of St. Thomas.

This series of waterfalls tumble into a radiantly blue river.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

Camels and crocodiles share the black waters of this stunning Saharan oasis.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

Hidden deep within a Filipino jungle is an incredible waterfall that plunges into a dazzling blue-green pool.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A computer bug so primitive it was an actual insect.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.