The ancient tomb acts as a calendar that keeps perfect time.

This center tells the story of one of the most famous battles in Irish history.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

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

When a missile testing site was proposed near this site in the Outer Hebrides, this statue was commissioned in response.

Despite what a Thai tourism board might want you to think, this white-sand beach is in fact located on a Scottish island.

The last manually operated turntable ferry in the world.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

A close look reveals that the Scottish monument is just slightly off-kilter.

The rusting remnants of a flying boat lie scattered near the site of its fatal crash.

This beach runway is off limits during high tide.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Ancient human remains unearthed around the iconic monument.

Famously misunderstood wonder of the ancient world

The Last Home of an Executed King.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

The UK's oldest theme park slowly slips away.

The geoglyph once sported a glass bottle eye.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

The only pub in the world surrounded by an ancient stone circle.