Nestled in a lush, quiet valley deep in the rugged Wicklow Mountains, among two lakes and acres of windswept heather, Gleann dá Loch ("glen of two lakes") is one of Ireland's premier monastic sites. The hermit monks of early Christian Ireland were drawn to the Edenic quality of some of the valleys in this area, and this evocative settlement remains to this day a sight to calm a troubled soul. Stand here in the early morning (before the crowds and the hordes of students arrive), and you can appreciate what drew the solitude-seeking St. Kevin to this spot. St. Kevin—Coemgen, or "fair begotten," in Irish—was a descendant of the royal house of Leinster who renounced the world and came here to live as a hermit before opening the monastery in 550. Glendalough then flourished as a monastic center until 1398, when English soldiers plundered the site, leaving the ruins that you see today.
Glendalough's visitor center is a good place to orient yourself and pick up a useful pamphlet.
Many of the ruins are clumped together beyond the visitor center, but some of the oldest surround the Upper Lake, where signed paths direct you through spectacular scenery devoid of crowds. Most ruins are open all day and are freely accessible.
Probably the oldest building on the site, presumed to date from St. Kevin's time, is the Teampaill na Skellig (Church of the Oratory), on the south shore of the Upper Lake. A little to the east is St. Kevin's Bed, a tiny cave in the rock face, about 30 feet above the level of the lake, where St. Kevin lived his hermit's existence. It's not easily accessible; you approach the cave by boat, but climbing the cliff to the cave can be dangerous. At the southeast corner of the Upper Lake is the 11th-century Reefert Church, with the ruins of a nave and a chancel. The saint also lived in the adjoining, ruined beehive hut with five crosses, which marked the original boundary of the monastery. You get a superb view of the valley from here.
The ruins by the edge of the Lower Lake are the most important of those at Glendalough. The gateway, beside the Glendalough Hotel, is the only surviving entrance to an ancient monastic site anywhere in Ireland. An extensive graveyard lies within, with hundreds of elaborately decorated crosses, as well as a perfectly preserved six-story round tower. Built in the 11th or 12th century, it stands 100 feet high, with an entrance 25 feet above ground level.
The largest building at Glendalough is the substantially intact 7th- to 9th-century cathedral, where you can find the nave (small for a large church, only 30 feet wide by 50 feet long), chancel, and ornamental oolite limestone window, which may have been imported from England. South of the cathedral is the 11-foot-high Celtic St. Kevin's Cross. Made of granite, it's the best-preserved such cross on the site. St. Kevin's Church is an early barrel-vaulted oratory with a high-pitched stone roof.