God's House Tower is formed by the joining 13th Century gatehouse and 15th Century gallery and three-storey tower. This building has served the town with a dual purpose as it was the town gaol and the Museum of Archaeology (closed in September 2011). The architecture of this building is worth marveling which are embellished with arched gateways and beautiful windows. The interiors of the gateway have ruins and remains of a mural stairway connecting to a parapet.