Explore hands-on exhibits about weather, climate, the Sun, the atmosphere, and art-science connections in this famous I.M. Pei-designed building. Other options: a wheelchair-accessible outdoor weather trail, guided tours for the public at noon on Monday/Wednesday/Friday except holidays, and a Guide-By-Cell audio tour (using your phone). Free admission, open 363 days a year. Hours: M-F 8am-5pm; Weekends & holidays 9am-4pm. Visit our website for information about your visit, including organized group tours and to find out about our two annual maintenance closure dates.