Teotihuacan is a mexican World Heritage Site, designated in 1987, the newest in my collection. This card sent by Linda "linda718" shows the Pyramide of the Moon.
"Teotihuacan is an ancient sacred site located 30 miles northeast of Mexico City, Mexico. It is a very popular side trip from Mexico City, and for good reason. The ruins of Teotihuacán are among the most remarkable in Mexico and some of the most important ruins in the world.
Teotihuacán means "place where gods were born," reflecting the Aztec belief that the gods created the universe here. Constructed around 300 AD, the holy city is characterized by the vast size of its monuments, carefully laid out on geometric and symbolic principles. Its most monumental structures are the Temple of Quetzalcoatl, the Pyramid of the Sun (the third-largest pyramid in the world) and the Pyramid of the Moon.
"The Pyramid of the Moon is smaller and faces a plaza at the northern end of the avenue. No cave or other feature has been discovered in its interior. Its form may be patterned on that of the sacred mountain to the north, the Cerro Gordo. The summit provides about the same range of view as you from its larger neighbor because the moon pyramid is built on higher ground. The perspective straight down the Avenue of the Dead is magnificent. http://www.sacred-destinations.com/mexico/teotihuacan