A gated cross stands on the site where an Irish revolutionary met his end.

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

It's said this geological anomaly was caused when the Devil took a bite out of the Irish mountainside.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

A former fortified tower now houses a collection of classic communications equipment.

The whiskey producer's archives includes a historical list of infractions committed by and associated penalties exacted upon employees.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

An important landmark in the history of algebraic logic.

A retired military stronghold on the rolling green coast of Donegal.

An oddly conical beacon perched atop beautiful Irish cliffs.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

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

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

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

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

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

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

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

An abandoned faux-pub made famous by a Guinness commercial.

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

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

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

A stunning Victorian abbey and walled garden on a lakefront.

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