It's actually part of the outer moat (Benkeibori) of the old Edo castle in Tokyo. Once upon a time it looked like this (second picture down) and this (third picture down).
Aside: Thanks for asking, as the Old Tokyo site I found and linked to above is quite fascinating...
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Date: 2005-04-09 10:02 am (UTC)Aside: Thanks for asking, as the Old Tokyo site I found and linked to above is quite fascinating...