"Eye-popping from the entry on in", this "first-class museum" in East Denver has "so much" to offer that you could "go for hours and still see only a small portion" of it; though the "terrific dinosaurs" (especially the "colossal T. rex") are the "main event", there's plenty more to see, including the "wonderful Hall of Life", "great IMAX theater", "top planetarium", "interactive" Space Odyssey exhibition and a host of "always-changing" attractions.