A beautiful giant castle and the place we are in has a lot of grass but it is on

A beautiful giant castle and the place we are in has a lot of grass but it is on top of a giant shell. The head of this gigantic turtle is shaped like a tower, has big yellow eyes and a very bizarre mouth. Only the four legs are four very large towers. I wanted it so big that the city it is passing by looks small. The image has to be in anime and it is a beautiful day.