One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

An Irish Memorial commemorating those who perished due to potato blight.

A daily replay of the experiment that proved the rotation of the Earth.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Elevated freight railway turned wildly successful urban park.

Avoid gangster interaction while window-shopping.

Cryptic messages embedded in the New York City sidewalk.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

One part local history, 99 parts gruesome haunted house.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Art and a pun, all in one.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A beautifully eclectic mix of architectural styles.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Museum preserving torture methods from the past.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.