Blackrock Castle
County Cork, Ireland
Blackrock Castle is a castellated fortification located at Blackrock, about 2 km from Cork city centre on the banks of the River Lee in Ireland. Originally developed as a coastal defence fortification in the 16th century to protect upper Cork Harbour and port, the site now houses an observatory, visitor centre and restaurant.
Observatory data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).