An ancient city was most likely ruled by females living in a "matriarchal society" more than 9,000 years ago, according to a study published in Science this week.

In a perpetually growing city, such change means the city’s soundscape will continue to evolve — until one day these newer sounds may themselves fade out and be replaced.

The Pyramid of the Sun is 246 feet high and 738 feet across, making it the third-largest in the world (number one is at Giza, Egypt, followed by the Pyramid of Cholula, near Puebla, Mexico).