High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Art and a pun, all in one.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

There has been an astronomical clock on this spot since the 14th century.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Protecting the dead from opportunistic body snatchers.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

For over 300 years this little carving has been the city’s good luck charm.

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

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

The world's largest reflecting pool is just two centimeters deep.

A series of abstract, silly sculptures represent the works of a great modern classical composer.