This document summarizes some of the most mysterious archaeological discoveries on Earth, including Atlantis, the Great Pyramids of Egypt, Stonehenge, Moai statues on Easter Island, and the Terracotta Army near the tomb of China's first emperor. It notes that while Atlantis is believed to have been located in the Atlantic Ocean based on ancient accounts, the exact purpose of structures like Stonehenge and how the pyramids were constructed remain largely unknown. The document was published on the website of Sadigh Gallery, an ancient art gallery that sells authentic artifacts and coins.