A sea cave with a waterfall and Viking past

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

This early version of the guillotine was used to execute the man responsible for its construction.

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

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

This 1920s Dutch barge is now a floating bookstore.

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.

Macabre astrological automaton clock dating to the late 1400s.

An iconic red telephone box turned tiny art gallery.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

This 19th-century sanctuary was built atop a hill that once housed a Roman fort.

The medley of artwork tells the history of this Scottish town.

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

A shiny sculpture celebrating the mighty mollusk.

A sculpture dedicated to the Roman history steeped in a Scottish town.

An abandoned, desolate train tunnel that was used during World War II.

This enormous, elaborate tomb looks oddly out of place next to a suburban Edinburgh bowling club.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.