Despite its reputation as one of the most famous monuments of antiquity, there is still very little known about the Great Sphinx of Giza. Egyptologists might have a small understanding of why the statue was built, but when, how, and by who is still shrouded in mystery. The pharaoh Khafra is the main suspect, which would date the structure back to around 2500 BC, but other scientists have argued that evidence of water erosion of the statue suggests that it is much older and perhaps even predated the dynastic era of the Egyptians. This theory has few modern adherents, but if true it would mean the Great Sphinx of Giza is even more mysterious than previously believed.