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

66,000 pieces of art, donated by one of the world's richest men.

A small pack of an ancient, hairless breed of dog once believed to guide souls through the underworld lives on its grounds.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The attic of a four-century-old canal house hides a clandestine church.

In the world's most bombed country relative to its size, this incredible organization helps pick up the pieces.

Khmer Rouge's high security prison.

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

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A gateway to a mysterious network of underground tunnels.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

The elaborate crypt where Peruvian heroes of the War of the Pacific were laid to rest.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

This stone complex marks the urban center of a lost civilization.