Describe the palace and describe how Gulliver was able to see it?

Gulliver stepped over the wall to view the outside of the palace, and then spent three days making himself two stools from the surrounding trees, so that he could position his body to see the inside.

The castle is described in the following way:

The outward court is a square of forty feet, and includes two other courts; in the inmost are the royal apartments, which I was very desirous to see, but found it extremely difficult; for the great gates from one square into another were but eighteen inches high, and seven inches wide. Now the buildings of the outer court were at least five feet high, and it was impossible for me to stride over them without infinite damage to the pile, though the walls were strongly built of hewn stone, and four inches thick.

I applied my face to the windows of the middle stories, which were left open on purpose, and discovered the most splendid apartments that can be imagined. There I saw the empress and the young princes in their several lodgings, with their chief attendants about them. Her imperial majesty was pleased to smile very graciously upon me, and gave me out of the window her hand to kiss.