Exhibits track the natural world since prehistoric time (anthropology to zoology). In the Rotunda, taxidermic African elephant Henry stars in a replica Angolan habitat. Hall of Geology, Gems and Minerals (Dom Pedro and the Hope Diamond), Hall of Mammals, Ocean Hall, Hall of Human Origins. Butterfly Pavilion ($6, $5.50 seniors, $5 children; Tues. free). Summer and Cherry Blossom season: Daily 10 am-7:30 pm. (regular hours till 5:30 pm.). IMAX theater ($8, seniors/children $6.50). Cafe and gift shop.