Where they appear in groups, often in a round, oval, henge or horseshoe formation, they are sometimes called megalithic monuments. These are sites of very old religious ceremonies, sometimes having burial chambers. The developments of radiocarbon dating and tree-ring calibration have helped us learn more of their timing. In some archaeological sites, the remains of wooden henges can be found. Woodhenge was a henge and timber circle monument in the Stonehenge World Heritage Site in Wiltshire, England. It is 2 miles (3.2 km) north-east of Stonehenge.
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