The Field Museum
Across its nine acres of floor space, the Field showcases giant robot wolf spiders, 23 Egyptian mummies, and the biggest Tyrannosaurus rex fossil ever dug up, in one of the broadest arrays of natural wonders under one roof. The collection of dioramas hold a dizzying array of species, from African lions and giraffes to Arctic penguins and polar bears, and it's a favorite childhood fantasy to slip inside one of the magical timeless worlds. Kids 12 and under can dress up like animals, dig up dinosaur bones, and explore a pueblo home at the Crown Family PlayLab. Friday nights from mid-January to mid-June, the museum hosts sleepovers, where children 6 to 12 and their parents can sleep right next to the dinosaurs (the 2012 nights are sold out, so book early for 2013). Talk about a dream vacation. 1400 S. Lake Shore Dr., 312/922-9410, fieldmuseum.org. Adults from $15; kids 3-11, from $10.