Stonehenge is the ancient monument located on the Salisbury Plain in England. This prehistoric structure is composed of a ring of standing stones, each around 13 feet high, with a circumference of about 1,000 feet. Believed to have been constructed between 3000 BC and 2000 BC, Stonehenge serves as a testament to the engineering and astronomical knowledge of its time. The exact purpose of Stonehenge is still debated, with theories suggesting it may have served as a ceremonial site, a burial ground, or an astronomical observatory. Today, Stonehenge is a UNESCO World Heritage Site and attracts many visitors.