An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The fairy tale castle of the "fairy-tale king."

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

The remote graves mark the mysterious deaths of four 19th century explorers.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

George Martin's Caribbean recording studio now rots within the shadow of an active volcano.

The closest thing to Mars on Earth.

A Mars simulation in the southern Utah desert.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

Thousands of letters to Santa get delivered to this mailbox in Greenland.

Three wildly colorful calderas top this otherworldly volcano chain.

Once home to Komodo dragons, this island dreamscape has a rare combination of white, pink, and black sand beaches.

A popular swimming hole that hides one of America's most deadly diving spots.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

This whimsical home made entirely from clay is basically a giant piece of pottery.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.