1. Chapultepec Forest
At 866 hectares, Chapultepec is the largest urban park in Latin America and the fourth largest in the world. It is split into four sections and holds museums, lakes, a zoo, a castle, and over 100 monuments. The National Museum of Anthropology, the Museo de Arte Moderno, and the Tamayo Museum all sit within its grounds, which means you could spend two or three full days here and still not see everything. The park has been occupied by humans for thousands of years. Archaeologists have found more than 4,000 artifacts on site. Chapultepec Castle, perched on the hill at the park's center, was the only real royal castle in the Americas, used by Emperor Maximilian in the 1860s and now home to the National History Museum. The park is free to enter, closed Mondays, and open from 5 AM to 6 PM the rest of the week. This is a must-see in Mexico City because it connects so many other places on this list. Combine your visit with the National Museum of Anthropology, then walk south through the park to the Museo de Arte Moderno. If you're staying in Condesa or Roma, the park's eastern edge is a short walk away along Paseo de la Reforma.