Visitors can see the remains of the commanding officer's house of the fourth century fort, including the impressive bath building, which contains one of the best-preserved examples of a hypocaust (underfloor heating system) in the whole of Britain. The site has also recently been endowed with a new reception building providing greater space for publications and souvenirs. Open 10.00am � 4.30. Guided Tours 11.00 am and 2.00 pm.