Truth be told, did not even go into the building. It earns 5 stars just from the outside of the building. A treasure trove of history! Within the outside walls of this building are parts from famous buildings throughout the world. Where else can you go to the pyramids, parthenon, ancient rome, aztec ruins, the gate of saint peters, david's temple, the berlin wall, harvard princeton and yale, the world trade center, the whitehouse, the pilgrims church in england, etc, etc, etc. A historic journey just by walking around the building. Where else can you see so much, and it costs zero to take it all in to boot!!!