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

Huge standing stones mark a site of megalithic mystery.

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

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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This ancient Irish landscape boasts hundreds of legendary ruins.

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

Though they've since been renamed, these two streets hint at Dublin's darker days.

The home of Ireland's last leprechauns is officially protected by the European Union.

The house where the writer spent his formative years.

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

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.

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

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

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

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

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A moody and picturesque riverside ruin overgrown with vegetation.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Local legend says the remains of Father Christmas lie within the medieval grounds.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

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