The ancient structure that served as a temple to the sun god in Egypt is the Temple of Karnak. Located near Luxor, it is one of the largest religious complexes in the world and was primarily dedicated to Amun-Ra, the sun deity, alongside other Egyptian gods. Construction began in the Middle Kingdom and continued into the Ptolemaic period, leading to a vast array of temples, chapels, and pylons. The Temple of Karnak was central to the annual Opet Festival, celebrating the link between the divine and the pharaoh, and remains a key archaeological and historical site, showcasing the grandeur of ancient Egyptian architecture.