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

Petrified footprints of one of the very first vertebrates to walk on land.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

This natural sea arch highlights Ireland's rugged coastal beauty.

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

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

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

The ruins of a medieval monastery named after a type of tree.

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

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

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

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A stunning Victorian abbey and walled garden on a lakefront.

A corkscrew-shaped barn in Ireland.

Obelisks and stone pineapples in the Irish countryside.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

An unusual manor of stunning beauty, born out of a crippling disease.

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