The Saitama Railway Museum is one of the best of Japan's many excellent railway museums. It was opened in 2007 by the East Japan Railway Culture Foundation, a non-profit subsidiary of the East Japan Railway Company (JR East). There's 30 railway cars, including next-generation Shinkansen models you can enter, simulators and a mini-shinkansen you can ride. The rooftop also offers a great vantage point to watch Shinkansen trains speed by via an elevated viaduct.