A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

It houses a menagerie of wondrous taxidermy specimens from around the world, including the remains of a famous gorilla.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

Banksy's image of a naked man dangling from the window of a sex health clinic.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

World's largest bell sits on the grounds of the Kremlin in Moscow.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

One man's remarkable private collection of art from around the world.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

A massive volcanic plug is now a protected area that hosts a number of bird species.

The hundreds of movies and television shows shot in this high desert town are commemorated in a unique museum.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

Highly spherical boulders on the shores of New Zealand.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

One of the world's steepest streets seems to have houses sliding down it.