This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

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

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

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

The ancient tomb acts as a calendar that keeps perfect time.

Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

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

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

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

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

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

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

An 1814 castle that hosts an exhibit of "explorabilia".

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

A corkscrew-shaped barn in Ireland.

Obelisks and stone pineapples in the Irish countryside.

Wallabies live naturally on this Irish island.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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