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

At the time of its construction, this hydroelectric power plant was the largest in the world.

A monument to a 19th-century Irish woman whose murder inspired several literary works.

This memorial was created by an Irish nurse who lived in New York City during 9/11.

The burial place of 14 of the executed leaders of the Easter Rising.

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

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

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

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

This supermarket offers shoppers a window into the past alongside their groceries.

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.

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

A teddy bear sits on a chair watching the sunset from the mountaintop—just as the late Dan Clancy had done since childhood.

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

This World War II relic let Allied pilots know they were entering neutral airspace.

This museum is dedicated to the most famous Irish writers in history.

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

An Irish peat mine has become a stunning sculpture park.

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

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

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

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