A corkscrew-shaped barn in Ireland.

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

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

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

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

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

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

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

A remarkably intact castle that once was the largest in Ireland.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

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

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

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

This 14th century tower house was once the home of Irish poet W.B. Yeats.

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

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

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

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.