The ancient civilization known for its monumental architecture, including Stonehenge, is the Neolithic culture of prehistoric Britain. Stonehenge, constructed between 3000 and 2000 BC, is one of the most iconic and enigmatic structures of this era. It was built using large sarsen stones and bluestones, likely serving religious or ceremonial purposes. The site reflects the advanced engineering techniques and social organization of the Neolithic people. Archaeological studies suggest that Stonehenge may have been a significant astronomical observatory, aligning with solstices and lunar events, indicating a deep cosmological understanding.