An ancient knight and a symbol of the city's freedom.

The castle still holds traces of the abandoned Roman fort it was built atop.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Museum preserving torture methods from the past.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Macabre astrological automaton clock dating to the late 1400s.

Looming communist pillar with a Czech twist.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

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

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

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

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

This memorial museum chronicles the apocalyptic destruction of the First World War.

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

This small red school was where Germany signed their surrender during WWII.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Perhaps the most spectacular grotto along the Algarve coastline.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

A subterranean playground in an abandoned slate mine.

Christ's blood preserved in a Belgian town.