Wander among the abandoned ruins of this once-powerful medieval town.

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."

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

Huge standing stones mark a site of megalithic mystery.

Wallabies live naturally on this Irish island.

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

What once sat in the world’s spotlight is today a largely disused ghost complex.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

A little-known park with unusual, half-ruined structures and a mystical energy.

The ruined doorway is a portal to the building's turbulent and torturous past.

An ambiguous ambience emanates from this centuries old leprosy quarantine.

The ghost town where the villagers refuse to leave.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This abandoned Greek island was the last active leper colony in Europe.

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.

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

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

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

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

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

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

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