This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

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

These little-known sands dunes are a geological anomaly in Saskatchewan's southern prairies.

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

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

The commemorative stone column conceals a secret laboratory.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This ancient Irish landscape boasts hundreds of legendary ruins.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

Ancient traditions and surreal birdwatching come into sharp relief along one of the world's most polluted rivers.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

The official meeting point for the oddly named governing assembly of ancient Sweden.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

This unique temple complex remains off the typical tourist trail.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

At 16,627 feet above sea level, this unstaffed station is the highest in the world.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This 16th-century mosque is the hallmark of the African architectural legacy in India.