25 Years After People
In the American Museum of Natural History, the dinosaur fossils are collapsing as they are taken over by pyrite. The blue whale model in the Milstein Hall of Ocean Life collapses as the supports fail. Many exhibits are falling apart.
50 Years After People
The Hayden Planetarium collapses onto the exhibits below. All the glass surrounding it has been blown out. In the Grand Gallery, the famous canoe has fell and rotted.
500 Years After People
The museum has almost completely disappeared. However, a few remnants still exist. Most notably, the gems and minerals are now buried under rubble. They have lost their shine, but they will likely survive.