Markree Castle, Co. Sligo

Mathematical Gazetteer of the British Isles

Edward Cooper was a noted amateur astronomer and had an observatory at his house, Markree Castle, c1850 [1].
See THIS LINK

References (show)

1. McDowell, R. B. & Webb, D. A. Trinity College Dublin 1592-1952 An academic history. CUP, 1982, p. 206

The Mathematical Gazetteer of the British Isles was created by David Singmaster.
The original site is at THIS LINK.