The Pyramid of Kukulkan, also known as El Castillo, is a majestic temple structure that serves as the heart of the ancient Mayan city of Chichen Itza on the Yucatan Peninsula in Mexico. This iconic site, recognized as one of the New Seven Wonders of the World, is an outstanding example of the architectural and astronomical genius of the Mayan civilization. Visiting this pyramid is an opportunity to touch the centuries-old history and mysteries of one of the world's most enigmatic cultures.
The structure is a strictly geometric step pyramid approximately 24 meters high. At its summit is a temple dedicated to Kukulkan—a deity in the form of a feathered serpent worshipped by the ancient Maya. The pyramid stands in the center of a vast terrace and has four staircases oriented to the cardinal points, each leading to the upper temple.

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The true magic of the Pyramid of Kukulkan is revealed twice a year—during the spring and autumn equinoxes. On these days, the play of light and shadow creates a stunning illusion on the steps of the northern staircase: it appears as if a giant serpent is slithering down. This unique spectacle, demonstrating the Maya's profound knowledge of astronomy, attracts thousands of travelers from all over the world.
In addition to visual effects, the pyramid served as a giant stone calendar. Each of the four staircases has 91 steps, which, when added to the top platform, equals 365—the exact number of days in a solar year. The pyramid's nine terraces, according to Mayan beliefs, symbolized the nine levels of the underworld. Thus, El Castillo is not just a temple, but a complex message encoded in stone.