Mexico is a land of staggering historical and geographical superlatives, beginning with the fact that it is home to the world's largest pyramid by volume. While many assume the record belongs to Egypt, the Great Pyramid of Cholula in the state of Puebla features a base four times larger than the Great Pyramid of Giza and is the largest monument ever constructed by humans. A second fascinating fact is that Mexico City has the second-highest number of museums in the world, trailing only London. With over 150 official museums, ranging from the world-class National Museum of Anthropology to the intimate Frida Kahlo House, it is a global epicenter for art and history. Finally, Mexico is one of the most linguistically diverse countries on Earth; while Spanish is the primary language, the government officially recognizes 68 indigenous languages, including Nahuatl, Maya, and Zapotec. This cultural richness extends to its biodiversity, as Mexico is home to the second-largest coral reef system in the world, the Mesoamerican Barrier Reef, which stretches along its Caribbean coast and provides a home to thousands of marine species, including the massive whale sharks that visit annually.