McCaig's Tower is a prominent folly on the hillside (called Battery Hill) overlooking Oban in Argyll, Scotland. It is built of Bonawe granite taken from the quarries across Airds Bay, on Loch Etive, from Muckairn, with a circumference of about 200 metres with two-tiers of 94 lancet arches (44 on the (...) (from Wikipedia)