A henge is, properly, a prehistoric banked earthwork in the shape of a circle or oval. When it is accompanied by standing stones it is more accurately described as a stone circle. Stonehenge is not a typical henge, but such structures - reasonably common in the British Isles - are often referred to as henges.
Part of the landscape gardening of Hellens Manor at Much Marcle includes an oval 21st century "henge" with inscriptions on each of the standing stones. Its purpose is to add interest and size to the available grounds and its location in a meadow beyond the formal gardens adds to the attractiveness of the feature.
photo © T. Boughen Camera: Olympus OMD E-M10