I think that is a drawing of a typical hospital that has been added onto about 17 times
Sounds like you've done construction work in a hospital; or worked in one; or had occasion to visit lots of friends in one.
My one uncle, in his later years, got to be a regular customer at his nearest hospital, in the next town over from us; when I went to visit him there, I felt like I should bring a lunch and a bag of color-coded bread crumbs: the lunch to sustain me as I walked down endless hallways and around endless corners, and the bread crumbs so I could find my way back.