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

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

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

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

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

Two stunning 17th-century libraries and a cabinet of curiosities.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.