Abernethy Round Tower. This tower and the similar tower at Brechin, in Angus are the only two round towers of the Irish Celtic type in Scotland. Here the Romanesque windows of the befry suggest that the tower was built in the later 11th Century. Long before this Abernethy was important as a principal seat of a Celtic Bishopric. Malcome Canmore and William the Conqueror met at Abernethy in 1072 possibly here.

See also...
Alex McGregor on Geograph
Bolckow on Flickr
Peter Hughes on Flickr
Nick Harrison on Flickr
Nick Harrison on Flickr
Nick Harrison on Flickr