The Academy of Natural Sciences(site info)
Philadelphia, world's leader in freshwater science research and biodiversity research, museum hosts dinosaurs, fossils, live butterflies, dioramas, offers environmental science education to adults and students, library and archives.
http://www.acnatsci.org/
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American Museum of Natural History(site info)
One of the world's top 10 institutions for scientific research and education in systematic biology, with collections of more than 32 million specimens and artifacts. Major educational resource in biology. Use the site map to find your way around the Web site.
http://www.amnh.org/