Portumna Castle was originally built in 1620, and is considered to be of major architectural importance as it represented a transition between vertical tower houses and later manor houses. The Castle is open to the public.
The forest park in Portumna covers some 1500 acres, and is home to an abundance of flora and fauna, including red deer, pine martens and otters. There is also an interesting nature trail, and the ruins of and old Dominican priory can be found here.