Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

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

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

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

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

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

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

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

This repurposed church offers a more literal way to get closer to the heavens.

Now home to a drinking establishment, this building has a macabre history.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

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

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

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

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This rustic old building is said to be the most photographed barn in America.

A miraculous natural phenomenon known as "the spring that breathes."

Tour the sci-fi-esque reality of governmental disease management.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The first declared National Monument in the United States.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Turn around and stick your head between your legs for the best view of this tree-covered sandbar.