Topping the hill above the White Horse of Uffington is an 8-acre hillfort, Uffington Castle, and the highest point in Oxfordshire. It was originally built in around 700 BC, a simple, but massive, ditch and bank, topped with chalk-filled timber ramparts. In about 300 BC, the timber was replaced with sarsen stones. The purpose of Uffington Castle is unknown. It might have been a gathering place of some sort, even a trading post. There are a number of Romano-British burials nearby and fairs were held in the fort in recent centuries.
Park in the National Trust car park for the White Horse