The usual features of the round towers may be thus summarised:
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Cross over the Doorway of Antrim Tower.
Doorway, Donaghmore Tower, Co. Meath.
Doorways.—In form these are similar to the doorways we have described as characteristic of the early churches, but they are generally more highly ornamented, and appear to have been furnished with double doors. They are placed almost invariably at a considerable elevation above the ground. A flat projecting band, with a small bead-moulding at the angles, is the most usual decoration; but in some instances a human head, sculptured in bold relief, is found upon each side of the arch. A stone immediately above the doorway of Antrim tower exhibits a cross sculptured in alto-relievo; and at Donaghmore, in Co. Meath, a figure of the Crucifixion, in bold relief, occupies a similar position. This style of decoration may have been much more common than is generally supposed, as, of the number of towers remaining in Ireland, the doorways of at least one-third have been destroyed. Concentric arches, with chevron and other mouldings, occur at Timahoe and at Kildare.
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Window, Round Tower, Cashel.