First, hat tip for this gorgeous website. Very well made. The UX is lovely.

Looking at Tokyo, Japan, I see that Hama-rikyū Gardens is included. Wiki says:

    > The main palace at Hama was destroyed by fire in 1724, and has not been rebuilt since.
Ref: https://en.wikipedia.org/wiki/Hama-riky%C5%AB_Gardens

As I understand, it is a beautiful garden, not a castle.