This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The most loyal of little dogs, or a Victorian era publicity stunt?

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

A sweet symbol marks the place where torturous executions were once carried out.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A book bound in the skin of an infamous criminal, along with countless other specimens.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

A huge, bustling local market in Panama City.

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

Follow the original medieval paths that wind through this intriguing section of the city.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The home of the first American-born saint is one of the only curved buildings in New York.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

A house carved into a rock in the 1940s.

A small flooded ghost town with a few scattered structures remaining.

Locals dubbed it the "Owl Building" because of its bird-like appearance.