This single-track road rewards brave drivers with stunning Scottish scenery.

Britain's only herd of free-ranging reindeer.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

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

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

One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

A black cottonwood gets a second life as a home for books.

After this former brothel closed, its interior remained almost frozen in time.

A nearly abandoned 19th-century town on the Palouse.

A graveyard for early settlers, sometimes called Old Pioneer Cemetery, hidden in the woods on a hillside.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

These fantastically named natural pools look like something out of a Scottish myth.

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

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Though they've since been renamed, these two streets hint at Dublin's darker days.

One of Ireland's most infamous prisons for rebels including men, women and children.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.