Sitting prestigiously on the west bank of the Nile in Giza, Egypt, is the Great Sphinx of Gaza. Claimed to have been built between 2558 and 2532 BC, the Sphinx is the oldest known monumental structure in Egypt and one of the oldest in the world. Century after century, the Sphinx has piqued the interest of archeologists and adventurers, and the weirdest theories have been put forward to explain the mysterious sphinx.