If you have kids, this nonprofit science center in the heart of Seattle is a must-visit, home to more than 200 indoor and outdoor hands-on exhibits, two IMAX theaters, a Laser Dome, a butterfly house, and a state-of-the-art Planetarium. The dinosaur exhibit—complete with moving robotic reproductions—is a favorite, and tots can experiment with water at the ever-popular stream table. Machines analyze human physiology in the Body Works exhibit. When you need to warm up, The Tropical Butterfly House is 80 degrees and home to colorful butterflies from South and Central America, Africa, and Asia; other creatures live in the Insect Village and saltwater tide-pool areas. IMAX movies, Planetarium shows, Live Science Shows, and Laser Dome rock shows run daily. Look for the giant white arches near the Space Needle and make a day of the surrounding sights. Pacific Science Center offers a number of lectures, forums, and "Science Cafes" for adults, plus a variety of educational programs for kids, including camp-ins, monthly parents' night outs, workshops, and more. See website for schedule information.