This science-based kids' attraction has been on Baltimore's waterfront forever. But it's no dinosaur—the Maryland Science Center is constantly reinventing itself with new exhibits and updates to old favorites. The planetarium, long a must-see, now uses digital technology to make the heavens sing. Hands-on exhibits have always been a mainstay here but The Shed takes that paradigm to new levels with wonderful projects, supported by an eager staff (recently kids and their parents were given the opportunity to make objects that flew). Exhibits are spread over three floors and include "Dinosaur Mysteries," displays about the Hubble Space Telescope, and a five-story-tall IMAX theater so popular the MSC screens films for the public on weekends. The Crosby Ramsey Observatory is free to the public on Fridays 7 to 10:30pm.