A quaint Russian village in the middle of a German metropolis.

This 600-year-old home seems to defy physics.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

In this truly magical place, rent hasn't been raised since the year 1520.

Floating swimming pool within a moored vessel.

An old department store turned Nazi prison turned artist commune.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Medieval village and microminiature museum.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Rare karst landscape eroded from a flat seabed.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

A once-magnificent collegiate church is falling into ruin.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This ancient theater was once the home of fierce gladiatorial battles.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

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

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.