Maryland Science Center, Baltimore, Maryland

With a surprisingly impressive and interactive dinosaur exhibit that has kids digging for fossils and assembling skeletons, this museum right on Baltimore's harbor is a must-see for dino lovers. But there are numerous other exhibits to take in as well, including SpaceLink, which lets kids take over mission control for a launch and Your Body: The Inside Story, which gives kids a chance to walk into a beating heart chamber. The museum staff also demonstrates everything from chemical reactions to optical illusions to electricity throughout the day. And don't miss the Planetarium show.