This stone tower was built to protect Crete from incoming pirates.

Khmer Rouge's high security prison.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

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.

These colorful staircases can be found around Goa’s capital.

In Old Goa, the former residence of the archbishop now houses a permanent exhibition.

The last remaining colonial-era Italian church in Old Goa.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A hugely vast Irish landscape of barren rock that stretches for miles.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

Bridge that died in war and was resurected.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Oriental bazaar in the heart of Sarajevo.

A small museum built by a family that survived the Siege of Sarajevo.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Ozymandias’ time-keeping temple.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.