This abandoned factory on the Hudson River once churned out a million bricks a week.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Topeka has its own great wall, and it's covered in colorful images from the city's history.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

This small Irish village suffered the greatest loss of life when the Titanic sank.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

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

A particularly disconcerting tribute to Irish martyrs.

The house where the writer spent his formative years.

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

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

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

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

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

Certain traditions prevail on the least-visited island of the Aran Islands.

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

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

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

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

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

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

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

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