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

A Jenga-style cylindrical tower of books that appears to go on forever.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A modernist landscape of water and sci-fi concrete.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Take a drunken tour inside the world's largest known geode.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The 10,000 Torii shrine.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

This frequently-photographed waterfall takes only a short hike to visit.

Tubing through a cave lit with glowworms is a magical underground experience.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A monument to the art of slicing people open.

An underwater city for the dead.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Bioluminescent firefly squid light up this Japanese fishing port.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Stunning wetlands ablaze with pink lotus flowers.

This lab's maddening silence is good for business but bad for sanity.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.