The Museum of Man featured Mummies and ancient Indian artifacts (the Mayan and Aztec). It also chronicled man's evolution (yes, from apes).
There was a Science Center that had a wonderful play area for children less than 5. Nathan had a great time playing with the musical instruments, the blocks and the make believe grocery store.
There was a water exhibit where you walked through a curtain of "water" with lights naming water in many languages. Jeff and Nathan must have walked through the curtain a dozen times because Nathan loved it.