Its construction (1630-1650) was intended to oversee the main roads in the country. Charles II declared Hillsborough a royal fort. It forms a square that measures 82 m on each side, with a lanceted bastion on each corner for lateral artillery attacks..

The building was begun in 1760 by Wills Hill, and became the residence of the governor of Northern Ireland. Today, it is use by State services. It occupies the western side of the square, behind a fine wrought iron gate erected in 1936 but designed i..

At the centre of the square stands a two-storey building that was once a covered market. Wings were added in 1810 to house the court house and a larger market. An educational exhibition on justice and goes back to the origins of common law and descr..

This Anglican church was built in 1662 and enlarged (1760-1773) by Wills Hill. He added the ain tower and steeple, as well as two smaller towers, decorated the interior with gothic oak woodwork and added boxwood pews that still stand in the transept.