Set at the edge of the ocean, in the spectacular Pier 15 setting, you can step inside a tornado, turn upside down in a curved mirror, count rings on a 300-year-old tree, build your own electrical circuits, and explore more than 600 hands-on exhibits, all at the San Francisco Exploratorium. The Exploratorium isn't just a museum; it's an ongoing exploration of science, art and human perception—a vast collection of online experiences that feed your curiosity.  And with these two passes, good for an adult or child, you can experience all the wonder the Exploratorium has to offer.