In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

From the Difference Engine to the Cray-1, all under one roof.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

This 700-year-old street food market features baby octopus and soy donuts.

A melting pot of Asian-Pacific art features one symbolic sculpture from each of 20 different nations.

The cemetery was built for the Spanish colonial elite, but its most famous residents were all buried in unmarked graves.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Cartoon clouds and nature-inspired murals have transformed the streets of Kuala Lumpur.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.