1) Townland of Fingal 
Dunsink ({irish place name|Dún Sinche|Fort of Sinneach}) is a townland in the civil parish of Castleknock, Dublin, in Ireland. It is most famous for Dunsink Observatory where William Rowan Hamilton and Hermann Brück were directors. It is the oldest scientific institution in Ireland. Built in 1783-1785, the observatory houses a 12 inch (30 cm) re...