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Photo: Romeparis, CC BY-SA 3.0 via Wikimedia Commons
There's been a castle here astride the Sligo road since the 14th century, and the picturesque watergate is from 1609, but what you see now is mostly 18th century when it was converted into a barracks. Most of the interior is a regimental museum for the Royal Inniskilling Fusiliers, founded in 1881 and amalgamated in 1968 into the Royal Irish Rangers (which in 1992 merged into the Royal Irish Regiment).
Enniskillen Castle is situated in Enniskillen, County Fermanagh, Northern Ireland. It was originally built in the 16th century and now contains the Fermanagh County Museum and a museum for the 5th Royal Inniskilling Dragoon Guards and Royal Inniskilling Fusiliers.