Mexico's sightseeing is one of the world's great urban heritage experiences multiplied across a country the size of a continent. The National Museum of Anthropology — the Aztec calendar stone, the Mayan stelae, the Oaxacan goldwork — requires a full day and rewards a second. The murals of Diego Rivera cover the walls of the National Palace with Mexican history in a scale that photographs cannot convey. The Frida Kahlo Museum and the floating gardens of Xochimilco extend the metropolitan register. Oaxaca's Monte Albán, the Yucatán Maya sites, and the colonial cities of Puebla and Taxco complete a sightseeing geography that is effectively inexhaustible. Tours by locals add the missing layer. Take it all in.