It would take a whole day to properly see this amazing museum, which would completely disrupt our walk. However, let's go in, have a cup of coffee at the steps, and see what they currently have in their ever-changing free-to-see area. We can also check out Diego Rivera's amazing mural Pan American Unity (aka "The Marriage of the Artistic Expression of the North and of the South on This Continent"). He painted it in 1940 for the City College and we're very lucky to have it finally accessible to everybody!