With one of the guests studying architecture, we visited some interesting architectures in Central Tokyo.
Above is the 2020 Tokyo Olympics Main Stadium where the ceremonies and the final of Soccer will be held.
It is done by KUMA, Kengo who also have a Paris office and one of the most popular Japanese architects now.
Below is another of his office works. There are many buildings designer by Pritzker Prize winning architects at Omotesando.
https://www.pritzkerprize.com/laureates
You can also enjoy very traditional style temple buildings at Askusa restored after WWII. Just let me know if you're interested in visiting those areas.