How researchers determined that Stonehenge’s giant Altar Stone came all the way from northeast Scotland
Credit: Pixabay/CC0 Public Domain No one is certain why Stonehenge was built. This world-famous monument on Salisbury Plain in Wiltshire is thought to commemorate the dead, and is aligned with movements of the sun and moon. It consists of an outer ring and inner horseshoe of large “sarsen” and “trilithon” stones, and an inner circle