Castle Acre Castle is the remains of a motte-and-bailey castle, with extensive earthworks, at Castle Acre, in the English county of Norfolk (). It is a Scheduled Ancient Monument, and a Grade I listed building. The castle was of motte-and-bailey construction; on the summit of the motte was the residence of the owner, and the last refuge in the event of an attack. The bailey below contained living quarters, stores and workshops. A strong curtain wall with wall walks surrounds the motte summit, and a lesser wall tops the bailey banks.