Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

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

The only quarter of the Old City not dedicated to a major world religion.

A magical oasis in the middle of the Negev Desert.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

A sweet symbol marks the place where torturous executions were once carried out.

A museum marks and documents the site of the Titanic's launch.

These barriers stand as stark reminders of Northern Ireland's troubled past.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's largest wooden structure.

A monument to a beloved aquatic folk hero in the Irish town of Dingle.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

One of Ireland's most infamous prisons for rebels including men, women and children.

3,000 market stands in five former Zeppelin hangars.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’

The oldest housing complex in Riga is a mini timeline of architectural trends.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.