The palace of Mycenae dates back to the 15C BC and consists of three blocks of buildings extending to the eastern spur of the site. The western block contains the megaron, the main element of the palace which is fairly well preserved, and the main stairs comprising 18 steps. The propylaia opened into the great open-air courtyard preceding the megaron, the outline of which can be seen on the ground. The upper terrace of the palace was altered by the later construction of a temple to Athena (a few traces remain).