Cholula Great Pyramid

The largest pyramid in the world by volume — larger than the Great Pyramid of Giza — the Great Pyramid of Cholula in Puebla State was built in multiple stages over 1,000 years and is so massive that the Spanish colonial church atop it appears to be sitting on a natural hill. The 8 kilometres of tunnels excavated through the pyramid's core are open to the public and reveal four successive construction phases.