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

This castle resides in a valley known for immense bloodshed during the Middle Ages.

A painted tribute to an ancient Egyptian king lurks along a stretch of Scottish shore.

One of Edinburgh's most popular works of street art is located well off the beaten path.

This short white tower is all that's left of Scotland's first permanently manned lighthouse.

“It has nae lugs!”

The healing properties of this well attracted royals and commoners throughout the Middle Ages.

These skilfully executed, poignant works of art dot a verdant Scottish dell.

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

Originally intended as a temporary installation, this sculpture is now a permanent part of a stunning Scottish beach.

The highest lighthouse in Scotland shines from an abandoned island.

This eclectic sanctuary is a hodgepodge of various architectural styles, all crammed into one building.

A serene public space nestled within the remains of Glasgow’s Victorian maternity hospital

A mysterious ruin shrouded in more folklore than fact.

The last manually operated turntable ferry in the world.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

Wonderfully preserved Victorian factory, complete with a preserved steam powered engine house.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

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

The abandoned transportation hub hides within the Glasgow attraction it once served.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.