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Artillery fort built in 1650 but prettified in 1758. The interior is closed.
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This is the park surrounding the ornamental lake just east of the fort. Multiple access points, generally always accessible but the car parks may be locked at dusk.
Grand Georgian mansion, the residence of the Secretary of State for Northern Ireland, and of royalty and VIP visitors. The Anglo-Irish Agreement of 1985 was signed here, and it was the setting for talks leading to the Good Friday Agreement of 1998. The guided tour of the house takes in some of the state rooms and the art collection. There are extensive gardens and parkland.