Markree Castle
About this place
Markree Castle is a castle located in Collooney, County Sligo, Ireland. It is the ancestral seat of the Cooper family, partially moated by the River Unshin. Today it is a small family-run hotel. In the 1830s the Observatory on the grounds of the Castle had the largest refracting telescope in the world. What today is known as the asteroid 9 Metis was discovered there in the 1840s by the Coopers' observatory staff.
Getting There & Parking
Markree Castle is located in County Sligo, roughly 138 km (2h drive) from Galway and 219 km (3h 15m) from Dublin. Nearby highlights within a short drive include Teeling Monument (2.8 km away).
Videos
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Markree Castle Wedding Venue Tour | Exclusive Castle Hire in Ireland (Sligo) 2026
Ladybird Ever After
Markree Castle Co. Sligo Ireland Wild Atlantic Way Travelvlog 2023
ShutterBug Infinity
Markree Castle Sligo
Markree Castle
Nearby places
Teeling Monument
Cloghagadaide
Giants Grave
Carricknagat Megalithic Tombs
Slieve Daeane
Coopershill House
More in County Sligo
More Castle in Ireland
See all →Classiebawn Castle
Strancally Castle
Westport House
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