This is a great opportunity to visit one of over 1000 museums nationwide. I
searched, but couldn't find where this had been posted yet.
Museum Day is an annual event hosted by Smithsonian Media in which
participating museums across the country open their doors for free to anyone
presenting a Museum Day Ticket.
This is a Printable Ticket - limit one per household. You can search by
State to find locations.
Link: http://microsite.smithsonianmag.com/museumday/?utm_medium=houseads&utm_campaign=m