The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

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

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

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

Some of the saint's blood and bones are said to reside in Dublin.

A particularly disconcerting tribute to Irish martyrs.

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

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

A standing relief of a Norman knight whose posture marks him as a Crusader.

The oldest licensed distillery in Ireland.

Huge standing stones mark a site of megalithic mystery.

Experience what life was like in Ireland during the Viking and medieval ages.

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

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

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

The oldest public library in Ireland.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An ancient neolithic tomb that only sees the sun twice a year.

A remarkably intact castle that once was the largest in Ireland.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.