The Castle and its grounds contain seven Grade I listed buildings. These include a "Deer House," which was built in 1760, a large castellated-stone building to shelter the deer, with picnic grounds and rooms that afford a fantastic view. The Park's listing summary states: A medieval deer park associated with the residence of the bishops of Durham, Auckland Castle, which has C12 or earlier origins, with landscaping of C18 date. Walled gardens around the Castle are of late C17 or earlier origin, as is the kitchen garden.