Egypt had the longest-lived ancient civilization along the Nile River, which provided transportation and resources. They practiced mummification to embalm and wrap bodies to be buried in pyramid tombs, believing in many gods and an afterlife. Some theories suggest aliens helped build the massive pyramids due to their precise dimensions and construction. King Tutankhamun became pharaoh at age nine and his treasures can now be seen in Cairo's museum, providing insights into daily life and religious customs of ancient Egyptians.