Once an early Christian burial site, it's believed the location was home to around 200 gravestones.

The eerie remains of one of Ireland's oldest castles, said to be haunted by the ghost of a woman who brings ill fate.

One of Ireland's best-preserved chambered cairns can be found next to a wishing tree.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

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

One of Ireland's lesser-known megalithic structures.

When the tide is high, you can see the Atlantic pushing up through a deep, jagged hole in the rock.

Ireland's most northerly island is hauntingly beautiful. Its lighthouse was the last glimpse of home for many Irish emigrants bound for the U.S.

Horse cemetery on the grounds of Blarney Castle.

An unassuming historical marker for an iron age fort leads you to an oddly adorned cemetery for unbaptized children.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

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

The ruins of a monastery that dates to the 7th century.

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

Ancient Bronze Age rampart that was used into the middle ages.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

This small Irish village suffered the greatest loss of life when the Titanic sank.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

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

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

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

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

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