Tiwanaku, located in the Andes of Peru, is a mysterious archaeological site from the pre-Inca period. Since its discovery in 1548, there has been much debate about its construction date and the identity of its builders. The Gate of the Sun is one of the most famous structures at this site, carved from a single massive block of andesite, standing 3.048 meters tall and 3.962 meters wide, with a doorway in the center and humanoid reliefs above it. It is believed that the Gate of the Sun was built in the 5th to 6th century AD as a religious structure, reflecting a profound mythological world. However, the details of its construction and the identity of its builders remain shrouded in mystery. Some believe it to be an 'alien gate' constructed by extraterrestrials, while others think it was built by ancient inhabitants using flat-bottomed boats to transport the massive stones from the lake. Despite the various theories, the uniqueness and mystery of the Tiwanaku site make it an important enigma in human history.