Powder Castle is a small 12th century earthwork motte and bailey fortress. Possibly built during the Anarchy in the reign of King Stephen, in 1147 it was a siege-castle to Barley Pound. Encased by the remnants of a ditch with an outer bank, the near-circular motte with its uneven summit is built of sand containing large flints. There are indications of a north-western bailey and the possible remains of buildings of an unknown date. With the dense cover of trees, its best view is in winter. 9 miles north-west is Odiham Castle.