 There are 33 Grade I listed buildings in West Somerset . The oldest is either <unk> Church , one of the smallest churches in England , and pre @-@ Norman in origin , or <unk> Steps , which may originate in the Bronze Age , although other sources date them from around 1400 . Dunster has the greatest concentration of Grade I listed buildings , including Dunster Castle , which was built in 1617 on a site which had supported a castle for the previous 600 years ; the <unk> Market , which was built in 1609 ; <unk> Bridge , which dates from the 15th century and the Priory Church of St George which is predominately from the 15th century but includes part of the earlier church on the same site . Other sites include manor houses such as the medieval buildings at <unk> Court and <unk> <unk> . 
