Two plaques commemorate the site of Shakespeare's first theatre.

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

Catacombs turned marketplace.

Hear the quietest sound from across the dome.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A surreal statue honoring Prague's favorite literary son.

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

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

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

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

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

Metro station with a claim to rock n' roll fame.

A monument to the man who almost killed Hitler.

Cold war icon and onetime "hole" in the iron curtain.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The most visited, and possibly most controversial, museum in Germany.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of the oldest masonic museums in Paris.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.