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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A layered tribute to the work of mosaicist Isaiah Zagar.

Only known mainland rookery of the threatened Stellar sea lion.

Hollowed out cedar log tubs set in an ancient towering forest.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A marvel of Byzantine engineering under the streets of Istanbul.

Less a museum than a bizarre fantasy world created by artists and engineers.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Mountain where Jesus was first tempted by the Devil.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

A blooming house of worship for the masses.