A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An ancient burial ground believed to have been used for ritual sacrifice.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

An enormous and lavish Gothic church in Czechia.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Steadily reminding Czechia of its past.

A bus with a butt and biceps to put Olympic athletes to shame.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Looming communist pillar with a Czech twist.

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

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Early prototype for Frank Lloyd Wright's Guggenheim.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Only hotel where you can legally launder money.

Golden Gate Park's historic collection of plants.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.