The Maya were an ancient civilization that lived in the Yucatan Peninsula from over 500 years. They had a complex writing system with over 800 symbols, and practiced human sacrifice in religious ceremonies. The Maya were skilled architects and artists, building pyramids and creating artwork. While common people wore simple cotton clothes, rulers wore elaborate outfits with jade and obsidian objects. Though the exact reasons are unknown, many theories suggest the Maya civilization declined due to disease, warfare, or environmental changes introduced by the Spanish conquest.