Port Discovery Children's Museum is a non-profit institution located in the historic Fish Market building in Baltimore, Maryland's Inner Harbor. It is 80,000 square feet and has three floors of exhibits and programs designed to be interactive and educational. It receives more than 265,000 visitors annually. The museum's focus is on children ages birth through 10 and their caregivers. The museum is served by the Baltimore Metro Subway's Shot Tower/Market Place station.