The term 'Ancient Monument Britain' refers to three ancient monuments located in Britain: a stele, Stonehenge, and a henge. A stele is an upright stone slab or pillar typically used as a monument or memorial. Stonehenge is a prehistoric monument located in Wiltshire, England, composed of earthworks surrounding a circular setting of large standing stones. A henge is a prehistoric monument consisting of a circular or oval area enclosed by a ditch and a bank, with an entrance at one end. All three of these monuments are considered to be important archaeological sites in Britain.