It was the northern citadel of Edo Castle, now a park with two protected gates.
After the Meiji Restoration the Imperial Guard set up its barracks here; the park you visit today only opened in 1969. Inside, besides the two castle gates, grows a rare moss (Hikari-goke, which reflects light like tiny mirrors), protected as a natural monument.
The park in the northern corner of the imperial grounds, around the Budōkan.
🚉 Kudanshita · 9 min walk
Holidays in Japan? Plan them with us.Over 2,000 real places, a day-by-day itinerary.FreeOpen the map →Sword Art Online
The last stop on Kirito's tour of Tokyo in search of the ‘ghost’, in ‘Ordinal Scale’: the sequence opens on the roof of the Budōkan, the encounter takes place at the vending machine in the rest area a little way into the footpath coming from the Budōkan car park, and the girl vanishes on one of the bridges over the pond. The Jōtōmyōdai stone lantern is also shown: it stands a little further east.
Sources: tianlang.s601.xrea.com · furaba-animeseichi.blog.jp · ja.wikipedia.org
Nearby
Shimizu Gate and Ushigafuchi Moat200 mphoto by chatani · CC BY 3.0
National Museum of Modern Art, Tokyo (MOMAT)400 mphoto by Wiiii · CC BY-SA 3.0
Shōwa-kan — museum of daily life in wartime400 mphoto by Olaf2 · CC BY-SA 4.0
Chidorigafuchi National Cemetery for the War Dead400 mphoto by Abasaa · Public domain