This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

A small museum full of giant effigies of Bali's demons and monsters.

This indoor ski resort has a mountain contained inside a mall.

The most alien-looking place on Earth.

North Korea's massive "hotel of doom."

The triumvirate of postwar Korea—Kim Il-sung, Syngman Rhee, and Lee Ki-poong—once vacationed on this seaside peninsula.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

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

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A tunnel of hardened lava along Maui’s famous Road to Hana.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The hallucinogenic center of the ancient world.

A semi-scholarly approach to sex.

An underwater city for the dead.

Peek into a cave of giant, glimmering crystals.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A winding, blood-red tunnel of hardened lava navigable by foot.

On a dusty county road sit the ruins of a ghost town's abandoned church.

Steep canyon walls hide a forested oasis in the West Texas desert.

The highest point in Texas is capped by a big silver pyramid.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A cave's rare beauty held a cavernous secret hidden underground.

A rocky shelter in the desert hides one of the largest concentrations of cave paintings in Mexico.