Dunmanus Castle is the largest and
best preserved, of the many O'Mahony castles on the Mizen
Peninsula. Because they traded with Europe most of their castles in the West Cork were built
near the sea. This fine castle is situated on the southern side of Dunmanus Bay on a turtle-
shaped rock, in a very romantic and picturesque site.
According to archaeologists, it is likely that the castle was constructed in 1430 A.D. by
Donogh More O'Mahony. It has six flanking towers connected with walls. It has a dungeon below
the ground floor, unique in O'Mahony castles. There are three floors, each with vaulted
ceilings and the corner tower, another unusual feature with five floors. There is a rather
complicated series of interior stairways because of this.