This rare and ancient Christian relic is one of Ireland’s oldest freestanding stone crosses.

This World War II relic let Allied pilots know they were entering neutral airspace.

Experience what life was like in Ireland during the Viking and medieval ages.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A former fortified tower now houses a collection of classic communications equipment.

This Neolithic passage tomb forms part of a World Heritage Site.

This concrete memorial commemorates a group of brave locals who saved the crew and passengers of a wrecked ship.

This unique rock formation has become a popular walking trail.

Huge standing stones mark a site of megalithic mystery.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

Believed to be the former location of one of the earliest Viking assemblies in Europe.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A collection of short standing stones covers this hillside.

The last water-powered beam pumping engine in Britain.

These engineering masterpieces are a dominant feature of the Belfast skyline.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A series of stained glass artworks that depict images of the hit TV show.

Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

This garden has existed for more than three centuries.

This large neolithic tomb, also known as Greengraves, is hidden off a Northern Irish road.