The Pyramid of the Sun is a large ancient structure located in the Teotihuacan archaeological site in Mexico. It is one of the largest pyramids in the world, standing about 65 meters tall. Built around 200 AD, it is made of volcanic stone and is part of a complex that includes other significant structures. The pyramid is aligned with the sun, and its construction reflects the advanced engineering skills of the Teotihuacan civilization. Visitors can climb its steps to enjoy panoramic views of the surrounding area, including the nearby Pyramid of the Moon and the Avenue of the Dead.