Stonehenge is a prehistoric monument on Salisbury Plain in Wiltshire, England, consisting of a ring of standing stones, each around 13 feet high and weighing close to 25 tons. Archaeologists believe it was constructed in several stages between 3000 BC and 2000 BC. The monument is famous for its celestial alignment; during the summer solstice, the sun rises over the 'Heel Stone' and shines directly into the center of the circle. The monument uses two types of stone: larger sarsens and smaller 'bluestones.' Remarkably, the bluestones were transported from the Preseli Hills in Wales, over 150 miles away—a massive logistical feat for Neolithic people. While its exact purpose remains a subject of debate, it is widely believed to have served as a burial ground, a ceremonial site, and an astronomical observatory.