There are only 5 days in the yearly calendar the Exploratorium is open free to everyone. Catch the first day on Groundhog Day, February 2, 2014. Explore, investigate, experiment, experience, understand and open your senses as you enter the great museum of art, sciences, local environment and your inner you. Now open to it's new home at Pier 15, Green St. on Embarcadero with bigger exhibits and more fun interactivities. Admission is not guaranteed so be there early due to limited capacity.