advance it is quite possible they did build it. A very good view can be had from its top and another old castle, Dunmahon Castle which is invisible from the ground level can easily be seen from the battlements.
In seventeen seventy-four a historian named Isaac Butler mentioned the fact that a subterranean passage ran from Milltown Castle to the Round Tower of Dromiskin but this passage cannot now be discerned. Butler then wrote "At Milltown there is a wonderful cave which runs, the inhabitants say, for three miles to the old church of Clogher, but it is so choked up that it would take two men's work in one day to open it." The cave is still spoken of though there is no one now living in Milltown area with any but a hazy idea of its location.