If you want to know more about the outposts along the Old Tokaido Highway, you could take a trip to Hakone. A faithful restoration of a guard outpost along the Old Tokaido Highway has been built on the exact spot it occupied along the lake. Racks of weapons used and even an outhouse are included. (It looks like a movie set.) And an Edo style teashop is located next to it where you can buy refreshments and take a brief rest.
Easy to get to, just do the Hakone loop tour. Info at this link
http://www.hakonesekisyo.jp/english/main/main.html
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