Obelisks and stone pineapples in the Irish countryside.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

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

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

Three small rooms at the back of the “official” church of London's clowns.

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

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

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."

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

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

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

The modern birthplace of Irish freedom.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

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

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