Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

A church dedicated to the Mexican skeleton saint.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

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

A quick and simple solution to Cambodia's train woes.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

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

Khmer Rouge's high security prison.

This zombie-themed restaurant stands out in the heart of corn country.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This seemingly charming home memorializes and honors the victims of a century-old unsolved murder.

The largest mosque in Cambodia was built to unite the country's Muslim community but soon sparked division and controversy instead.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

An underground magnet for ever-changing street art.