Frida Kahlo's childhood home, now a museum of her life and works.

A striking 12th-century-style castle built on the edge of a cliff.

Walk in the footsteps of the gods and straddle two tectonic plates.

A seemingly endless landscape of pure salt stretches far across Bolivia.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A battle between nature and architecture in the Cambodian jungle.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Nine Gardens in one—with tea service.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The hallucinogenic center of the ancient world.

Houses are tucked between, on, and underneath giant boulders.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Open-air museum with an elaborate sculpture garden, stretching for over 70,000 square-meters.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

This Japanese national treasure was originally built in 593.

Stunning wetlands ablaze with pink lotus flowers.

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