Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.

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

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Modern sundial uses ancient methods to tell time and date perfectly.

A standing relief of a Norman knight whose posture marks him as a Crusader.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

Certain traditions prevail on the least-visited island of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

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

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

Just another ancient, mysterious Irish stone circle.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.