Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

A pair of gigantic baby heads greet passengers at Atocha Station.

A neighborhood represented by an apparent geocentric and flat-earth model of the Solar System is hidden in the subway of Madrid.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

Historic medieval fortified city in southwest France.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The last bastion of Roman presence north of the Alps looms over a German town.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

A former ironworks that was the first UNESCO industrial site.

Fantastic views and thousands of love locks.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

Is this statue at Naumberg Cathedral the fairest of them all?

A 12th-century fortress containing some of Berlin's oldest buildings.

An eerie, derelict amusement park in Berlin.

Metro station with a claim to rock n' roll fame.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Berlin's old airport.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.