The Classic Maya period lasted from approximately 250 to 900 CE and is known for the development of advanced city-states in the region that is now Mexico, Guatemala, Belize, and Honduras. During this time, the Maya built impressive cities with large pyramids, palaces, and temples, showcasing their architectural skills and urban planning. This period also saw significant advancements in art, mathematics, and astronomy. The Maya created intricate pottery, sculptures, and murals, while also developing a complex writing system known as Maya hieroglyphics. Their understanding of the cosmos led to the creation of detailed calendars, which played a crucial role in their culture and daily life.