See the Uffington White Horse

Though a number of white horses and other white figures exist on the chalk downland of Southern England, the Uffington Horse is particularly special as it is believed to date from the the Iron Age or the late Bronze Age, making it significantly older than many of its contemporaries. 

The horse is found close to the ancient trackway known as the Ridgeway and sits just below Uffington Castle, an ancient hill fort with which it is often assumed to be connected.

For more, see http://www.nationaltrust.org.uk/white-horse-hill/