Google maps tokyo
https://files.mastodon.social/media_attachments/files/113/484/976/049/775/683/original/fd12b0f4786df3b7.png
So there's this big block of green space right at the center of Tokyo, at the entrance to the bay, that seems to all be public land. When I entered the block a sign informed me I was entering the boundary of historical Edo Castle. There seem to be several different sectors, one of which is the "Kitanomaru Park" I'm in now which houses a bunch of museums and the national archives, and one of which is the modern imperial palace. I'm sure Wikipedia explains the exact arrangement somewhere.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.