Hello-
FYI. One of the three Callahan Castles in Ireland was at Clonmeen just
south of the Blackwater River in County Cork, Ireland.
It was built around 1590-1610 and was destroyed by war c. 1641. The
cannonballs which battered the walls have been found there. The outside
walls were approximately square in shape and were each about 250 feet long
and three feet thick. At the four corners were circular 2 or 3 story towers
with gun "loops" (V-shaped openings) to shoot out from. Inside the walls
there was a castle "keep" which has completely disappeared. That limestone
was later used to make a lime kiln.
I just located the castle ruins using Google maps to search the area near
the village of Clonmeen North, south of the River Blackwater. If you want
to see a great aerial view of the remains of the castle, type in or copy
and paste these coordinates into Google Maps 52.138562, -8.864036 The
coordinates are for a road intersection. Just a little up and to the right
you will see a big square with circular tower remains for 2 of the 4 towers
(There are partial remains of a third tower but that's not really visible).
There are also some black and white cows in the field just to the right.
There are several street views of the castle ruins from the road.
-Kevin L. Callahan
Minnesota