美杜莎寺, also known as the Basilica Cistern, is an ancient underground water reservoir located in Istanbul, Turkey. Built during the reign of the Byzantine Emperor Justinian I in the 6th century, it was designed to store water for the Great Palace of Constantinople. The cistern features a stunning array of columns and arches, creating a serene atmosphere. One of the most famous features of 美杜莎寺 is the two Medusa head sculptures used as column bases. These heads are positioned at the far end of the cistern and are believed to have been repurposed from earlier Roman structures. The site attracts many visitors due to its historical significance and unique architecture.