I've also just returned from a visit to Mexico City. While I was there, I visited the Museo Nacional de Antropologia and was fascinated by the various skulls on display. I took a video of an exhibit there which has images of skulls that fade into images of human faces as you move across the room.
Often I have my students try to overlay a drawing of a skull on top of a photo of a person, so I found this display very intriguing and useful. I hope you find the portions I recorded enjoyable; I did my best to hold the camera steady.