A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Not actually a shop, but one fan's passionate show of support for a rival county's Gaelic football team.

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

This World War II relic let Allied pilots know they were entering neutral airspace.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

A massive Celtic cross secretly growing in an Irish forest.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

A retired military stronghold on the rolling green coast of Donegal.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

This beautiful site is where the first transatlantic telegraph was sent from.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

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

Ancient Bronze Age rampart that was used into the middle ages.

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

This 14th century tower house was once the home of Irish poet W.B. Yeats.

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

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

A stone wall that mysteriously moved three feet from its foundation.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

Some of the saint's blood and bones are said to reside in Dublin.