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.

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

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

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

An ancient neolithic tomb that only sees the sun twice a year.

The inscribed stone at Kilnasaggart is a remnant from nearly a millennium ago.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

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

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

A stone wall that mysteriously moved three feet from its foundation.

An elaborate Romanesque archway, built right before the British occupation of Ireland.

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

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

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

The symbolic center of Ireland, this summit also offers panoramic views of the countryside.

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

The largest stone circle in Ireland.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

The remains of a 13th-century Franciscan friary have survived multiple attempts at destruction, most recently in 1921.

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

Just another ancient, mysterious Irish stone circle.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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