Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

Looming communist pillar with a Czech twist.

Macabre astrological automaton clock dating to the late 1400s.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

The first mosque in the world to receive electricity.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.