You can buy admission tickets online. Visitors who purchase online general admission tickets may have to wait in lines within the museum, including coat check or entrance to special exhibitions. Discounts and vouchers cannot be applied through online sales. Online general admission tickets are valid for one year after the date of purchase. (special exhibitions not included, i.e. Envisioning 2001: Stanley Kubrick’s Space Odyssey.) All sales are final and payments cannot be refunded.