Before leaving Tokyo for Osaka, I visited the double bridge outside the imperial residence of Japan. Dual Bridge is located in front of the main entrance of Huangju, across the inner moat, which is recognized as a symbol of Japan. Dual Bridge is a special passageway to the palace. It is generally not accessible unless there is an application for a visit to the palace house or a special day of celebration. Looking from the square in front of the imperial residence toward the palace, you can see two bridges "the main gate stone bridge" built by stone and "the main gate iron bridge" built by iron behind. Therefore, they are called "the double bridge". The moat under the "double bridge" is considered to be the most beautiful place in the imperial residence, reflecting the calm water surface of the double bridge, which adds unusual charm.