The ancient structure that served as the epicenter for the Mayan civilization is Tikal. Located in present-day Guatemala, Tikal was one of the largest and most influential cities during the Maya's Classic Period (250-900 AD). It displayed remarkable architecture, including grand temples and palaces, and was a center for politics, culture, and religion. Tikal's advanced society is evidenced by its rich history of astronomy, mathematics, and hieroglyphic writing.