Nihonbashi
Nihonbashi, major commercial area in the Edo period (1603-1867), is the starting point of five major roads that lead into and out of Tokyo. Today, the Nihonbashi bridge carries a bronze signpost with the words "Origin of Roads in Japan," and the location is used as a base point to measure distances from Tokyo.
Since it's located near central Tokyo, there are many new buildings and shopping center, but also, there are many traditional Japanese sweets shop, craft shop and restaurants that established in the Edo period too. You can enjoy modern side and traditional side of Tokyo.