Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

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

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A 30-acre garden inspired by the principles of modern physics.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

100-year-old shipwreck you can walk up to at low tide.

An ancient Egyptian temple in the middle of Madrid, Spain.

Built to hold the worst of the worst of the Nazi war prisoners.

This bronze statue was erected to honor a small Scottish town's beloved stray cat.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

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

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

The oldest house in Glasgow is now a museum dedicated to the city's medieval history.