Glendalough, Gleann dâ Loch, means the "valley of the two lakes". This valley was carved out by a glacier during the ice age. There are now two lakes here and many ancient remains.
There is a round tower dating from the 10th and 12th centuries. The
tower is some 103 ft (31 metres) high. It was used as a bell tower
to call pilgrims from afar. It was also used to hide in when the area
was under attack . To this end the door is about a third of
the way up the tower and was reached by a ladder that could be pulled up
to stop others entering.
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