A Jenga-style cylindrical tower of books that appears to go on forever.

This doorless 20th-century elevator doesn't stop or slow down.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

Monument to a suicide protesting the Soviet invasion.

A mocking tribute to the past and modern leadership of Prague.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

A darkly erotic open-air statuary in Catalonia.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

The quirky - and private - constructions of a secluded artist depict the house of God.

These magnificently sculpted tombs represent Spain's own legendary version of "Romeo and Juliet."

This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

The legendary bathing site of a Moorish queen is actually part of a Roman fish farm.