This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large part in Dublin.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

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

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

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

This beautiful site is where the first transatlantic telegraph was sent from.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

Ireland's only German military cemetery holds the remains of a spy who was moved there under the cover of darkness.

An Irish peat mine has become a stunning sculpture park.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

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

This Copper beech tree nestled on a nature reserve is host to a bevy of autographs from Irish literary icons.

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

An oddly conical beacon perched atop beautiful Irish cliffs.

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

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

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

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

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

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

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

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.