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.

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

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

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

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

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

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

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

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

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

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

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

Just another ancient, mysterious Irish stone circle.

The ruins of a medieval monastery named after a type of tree.

Huge standing stones mark a site of megalithic mystery.

This ancient Irish landscape boasts hundreds of legendary ruins.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

Wander among the abandoned ruins of this once-powerful medieval town.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

The home of Ireland's last leprechauns is officially protected by the European Union.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.