Hillsborough Castle

Hillsborough Castle is an official government residence in Northern Ireland. It was the residence of the Secretary of State for Northern Ireland. Hillsborough Castle is used by Queen Elizabeth II and other members of the British Royal Family when they visit the country and also hosts other prominent international visitors. 
History.
From 1922 until 1972 it was the residence of Governor of Northern Ireland.
In April 2014 it started being taken care of by the Historic Royal Palaces. It can be viewed by the public who paid for entrance to tour it.