During the Edo period, each village had its own gate, which was guarded by the villagers. As Takanawa was the entrance to Edo, it was called Okido, or large gate, and it was here that travelers made a final check of their equipment or met or saw a person off. The stone fence still stands on the railroad-track side of Dai-ichi Keihin (Route 15). In order to make an accurate map of Japan, Ino Tadataka used Takanawa Okido as the starting point for his survey and spent 17 years walking all over the Japan pushing a survey car that he had designed himself. That was on 19 April 1800, when he was 55 years old. The map was completed by Tadatakafs apprentices three years after his death at the age of 74, and presented to the Tokugawa Shogunate. It was Philipp Franz von Siebold who was banished from Japan after his attempt to take the map out of the country was discovered.
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