At most museums you are told “Do Not Touch,” but that’s the exact opposite of the intention at San Francisco’s Exploratorium. This institution’s goal is to promote museums as education centers, and here they like their visitors to learn by doing. Whether it’s creating a tornado with your feet, putting samples under a microscope, or getting your hands wet touching sea creatures, the unique Exploratorium has hundreds of exhibits for your enjoyment in science, art, and human perception.