The Portland Art Museum owns the city's largest art collection and presents a variety of touring exhibitions each year and, with the recent addition of the Modern and Contemporary Art wing, it became one of the United States' 25 largest museums. Other museums include the Portland Children's Museum, a museum specifically geared for early childhood development; and the Oregon Historical Society Museum, founded in 1898, which has a variety of books, film, pictures, artifacts, and maps dating back throughout Oregon's history. It houses permanent and temporary exhibits about Oregon history, and hosts traveling exhibits about the history of the United States.