About the American Museum of Natural History:
Visiting the fourth floor of the American Museum of Natural History in New York is a bit like dying and going to dinosaur heaven: there are over 600 complete or near-complete fossils of dinosaurs, pterosaurs, aquatic reptiles, and primitive mammals on display here (these are just the tip of the prehistoric iceberg, since the museum maintains a collection of over one million bones). The large exhibits are arranged "cladistically," demonstrating the evolutionary relationships of these extinct reptiles as you go from room to room.
Why does AMNH have so many fossils? This institution was at the forefront of early paleontology research, represented by such famous paleontologists as Barnum Brown and Henry F. Osborn--who ranged as far afield as Mongolia to collect dinosaur bones, and brought the best samples back to New York. For this reason, a whopping 85 percent of this museum's display skeletons are composed of real fossil material, rather than plaster casts. Some of the most impressive specimens are Lambeosaurus, T. Rex and Barosaurus, among a cast of hundreds.