Home to the largest area of natural woodland in Northern Ireland, the National Trust's beautiful Crom Estate is a haven for pine martens, rare bats and many species of bird. You can walk from the visitor centre to the ruins of old Crom Castle, with its ancient walled garden, abandoned bowling green, gnarled yew trees and views over the reed-fringed lough.
The estate is on the eastern shore of Upper Lough Erne, 5km west of Newtownbutler.
For views of Crom from the lake, rent a rowing boat (per hour £7.50), canoe (per half-day £15) or outboard-engine boat (per day £45); ask at the visitor centre, book ahead in summer. See the website for details of upcoming events.