In addition to the natural beauty, two freshwater lakes, and rampant wildlife (it's apparently a haven for many types of birds), the property is also steeped in history. It's thought that its first human inhabitants settled there some 3,000 years ago, and that monks converted what was then a secular community into a monastery in the 7th century, according to a report from The Guardian. More recently, it was owned by poet who sold it in 1998.
Ruins from the monastery, including a church, altar, graves, and "beehive huts," are still around, though they're technically not part of the sale since they're owned by the Irish state. The rest of the property, which is currently owned by a private person, is all up for grabs, though.