Around 100,000 years ago, savanna rich in flora and fauna covered the territory of present-day Baku and  Absheron. Traces of human settlement go back to the Stone Age. Bronze-Age rock carvings have been discovered near Bayil, and a bronze figure of a small fish in the territory of the Old City. These have led some to suggest the existence of a Bronze-Age settlement within the city's territory. Near Nardaran, a place called Umid Gaya features a prehistoric observatory, where images of the sun and of various constellations are carved into rock together with a primitive astronomic table. Further archeological excavations have revealed various prehistoric settlements, native temples, statues and other artifacts within the territory of the modern city and around it.