An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

A beautifully eclectic mix of architectural styles.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

A 16th-century Andalusian palace.

A Spanish town built into the cliffs.

A fortified city, home to a remaining population of five families

God's Saharan sandbox of wrath.

“The oddest pub in South Africa,” inspired by a practical joke.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Malaysian fireflies create a dazzling display as thousands light up in unison.

The largest tea plantation in Southeast Asia supplies gorgeous vistas alongside tea for the surrounding countries.

Once the private home of China’s most legendary tycoon, getting inside this stunning mansion no longer requires an elite pedigree or acts of daring.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.