Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A unique sculpture cemetery dedicated to the region's defunct businesses.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

Art and a pun, all in one.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An epic sculpture depicting a wagon and straining oxen.

This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

Where sweethearts leave their love locks in the Uruguayan capital.

A replica of a famous Greek statue adorns the front of the unusual home of architect and alchemist Humberto Pittamiglio.

Constructed on the ruins of a convent, this tower saved countless lives.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

Fantastic views and thousands of love locks.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A famed artist's inspiring work of peace and tolerance.

It's good luck to be mocked by this monkey.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

This remarkable parking garage in Darmstadt has lived several lives and still contains remnants of its World War I past.

A towering monument to war, located on a beautifully peaceful hill.

Berlin's old airport.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.