Legend says the water within these mysterious sacred springs stays cold even when boiled.

A beloved upside-down beacon off the coast of Northern Ireland.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th-century.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A once extravagant mansion, now reduced to ruin.

An ornate "graveyard" for some of the country's forlorn building relics.

This unusual statue overlooking the Royal Mile has an interesting backstory.

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

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

An ancient stone wall formed by lava that was a frequent stop during funeral marches.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

A carved bench marks the Scottish cave that inspired the classic adventure novel "Treasure Island."

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

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

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

Described by William Wordsworth as a "World of Wonder."

The farthest northwesterly point of the British mainland is one of the most remote places in the Scottish Highlands.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

An optical Illusion once believed to be an electrical phenomenon.

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

A trio of giant megalithic stones in the middle of a golf course.