How does one build a castle between Heaven and earth?
Figuratively speaking, with love. But that would be rather a bridge than a castle. Actually maybe both. Love can do and achieve anything/everything.
By the way, I also have a bird. Not an eagle. A Harris's hawk. We love each other. When I am with her, I feel like that I have my own heaven on Earth.
Have a nice day. All the best. Greetings and much love from Hungary.