You may have heard this area called Nijubashi, which translates to Double Bridge. However, if you look closely behind the first stone bridge, you can see a second, dark iron bridge higher up. This inner bridge, known as the Seimon Tetsubashi, is the actual Nijubashi. The name Nijubashi originates from the Edo period, between 1603 and 1867. Back then, the bridge was made of wood. Because the moat was so deep at that point, builders had to layer one wooden bridge on top of another to support the structure, creating a literal two-story, or double-layered bridge. Although the wooden bridge was replaced by this steel one in 1888 and later renovated in 1964, the name stuck. The iron bridge is used primarily for special state ceremonies. For example, when new ambassadors arrive to present their credentials to the Emperor, they are sometimes driven across this bridge in a horse-drawn carriage. It is a site of extreme prestige and exclusivity. You are standing at a viewpoint that was once reserved only for the elite of Japanese society, but today, this majestic view is open for everyone to enjoy from the plaza.