An explosion of natural color known as "the river that ran away from paradise."

A dangling church built over a Colombian gorge.

This hidden gem is bathed in beautiful natural light.

A sixth-century Byzantine cistern hidden below a modern carpet store.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

The ornate miniature mansions were built for Istanbul's feathered residents.

A Turkish ghost town abandoned in a population exchange with Greece.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

A progressive LGBTQ hub offers dancing, HIV testing, art, and more.

North Korea's massive art and propaganda factory now has an official gallery space in Beijing.

Natives of this mud-brick desert village use an ancient irrigation system to grow sweet, seedless grapes.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

A centuries-old fortress city lies in ruin.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

Modest by day, illuminated majestically at sunset.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

A labyrinthine museum chronicling the history of African culture in Brazil.

The massive gardens and office of a Brazilian sculptor.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.