Carrowkeel - 14 passage tombs on a mountain top, built around 3200-2400 B.C. Castlebaldwin, Co Sligo. "for me the spot that most invokes the essence of Ireland is Carrowkeel passage tombs, west into the hills from Castlebaldwin, in Co Sligo" - The Irish Times
Carrowmore megalithic cemetery - the largest cemetery of megalithic tombs in Ireland. Knocknarea, Co. Sligo.
Creevykeel - atmospheric and very accessible court tomb only metres from the main Bundoran to Sligo road.
Inishmurray island - an abandoned island off the coast of sligo with the remains of a 6th century monastery (images, tours)
Parke's Castle - A restored 17th century plantation castle on the shores of Lough Gill
Sligo Abbey - 13th century, contains Gothic and Renaissance tomb sculpture, well preserved cloister and the only sculptured 15th century high altar to survive in any Irish monastic church.
Lissadell House and Gardens ~2k en route to Raughley.