Dedicated to improving the plight of the rare scaly anteater.

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

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

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

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

A battle between nature and architecture in the Cambodian jungle.

Khmer Rouge's high security prison.

A Nazi concentration camp and Anne Frank's place of death.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

A moving memorial to the fallen and missing from WWI trenches.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

A rare example of World War I trenches from the British front.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The secret wartime bunker built on the platforms of an abandoned Tube station.

A Roman spa buried deep beneath the City of London.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.