Discover your world past and present. See dinosaurs in our new Dinosaur Hall, including the worlds only Tyrannosaurus rex growth series. Get the behind- the- scenes look at how scientists work on fossils at our Dino Lab. See 240 specimens, including skeletons from mastodons to whales, animal dioramas from North American and Africa, and more.Stroll through our extensive Nature Gardens, and discover true stories about plants and animals in our Nature Lab. See and touch more than 2,000 spectacular specimens displayed in our Gem and Mineral Hall, and enter into the vault to view diamonds, rubies, sapphires, and other exquisite gems. Our Butterfly and Spider Pavilions are open seasonally. Here you can wander through the changing ecosystem with over 30 species of fluttering butterflies all around you, or witness arachnids up close and personal.