The huge  National Museum of Anthropology in Chapultepec (Grasshopper) Park in Mexico City is one of the most extensive of its kind in the world.  There are numerous rooms that house archaeological artifacts (originals or replicas) from the numerous ancient cultures in Mexico, including Olmec, Mexica, Maya, Golfo, Aztec and others.  In one courtyard there is a reproduction of an entire building that has an intricate facade of carvings and designs that are very distinctive.  One of the most valuable pieces in the museum, according to the guidebook, is a "Monkey Cup" made of black obsidian.  One reason that it is so valuable, besides its antiquity, is that the ancient Mexicans did not have access to diamonds, so carving an entire cup with the form of a monkey on it and polishing it in a medium as hard as obsidian (similar to glass and quartz in hardness) was no easy task. Some scientists say it took generations to create such a piece.  The folk dancers and other entertainers which perform in the park near the museum are also excellent and authentic, as are the vendors with their foodstuffs, etc. laid out on blankets in the park plaza.