This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

A relic from the Industrial Revolution got a second life as a contemporary performing arts space.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This giant sculpture made of trash is a critique of society's wastefulness.

This spooky statue sits outside a famous Prague theater.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Dedicated to one of the darkest moments in Irish history.

An early 20th-century bullring converted into a modern shopping center.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This London marker celebrates the spot where the world-famous English band was founded.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

A hidden path at the National Theatre lets you look behind the scenes of the latest productions.

This whimsical public art installation is a unique homage to Liverpool's industrial heritage.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The shop where the girl who inspired the beloved character once bought sweets is now a book-themed commercial curiosity.

The bronze uniforms commemorate the vital role of women during World War II.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.