Abandoned for over a century, this chilling train tunnel is now a destination for ghost hunters.

The first outlet of Canada's biggest fast-food franchise has been slinging doughnuts since 1964.

A small memorial commemorates a man who died at Kilkee Cliffs.

This center tells the story of one of the most famous battles in Irish history.

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

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

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.

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

Behemoth, cannon-like telescope operated by generations of Irish earls.

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

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

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

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.