The Kansas City Museum at Corinthian Hall is a small museum in the historic Northeast Neighborhood in Kansas City, Missouri, United States. Also known as the R.A. Long House, the 3-acre (12,000 m2) plot consists of Corinthian Hall and its outbuildings, most of which have been renovated to contain various displays concerning local area history and natural sciences, a 50-seat planetarium, and a 1910-style soda fountain that serves up phosphates and ice cream.