A nightmare for the claustrophobic lies hidden in Southeast Asia.

A battle between nature and architecture in the Cambodian jungle.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

A man-made island in scenic San Francisco Bay.

An extensive collection of ancient Egyptian artifacts and mummies.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Towering basalt columns, a creation of fire and ice.

A trash dump made beautiful by nature's power.

The unbelievably opulent home built for an infamous newspaperman.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Regency-era excess on the English Coast.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.