I would like to know what "tucked in below the ramparts of the faculty grounds" means in the following sentences:
During those weeks, you and I would go to the university pool every now and then. It wasn’t far from the Old Town, tucked in below the ramparts of the faculty grounds. I remember its large reception hall and the strong smell of chlorine – how I liked that smell – and the cloakroom where we left our shoes in a shared cloth bag. In the changing rooms we undressed amongst other boys, drying themselves, joking around, unaware of their nudity, or used to it like something that was a given – strong backs and thighs and asses, skin smooth and covered in drops like forest leaves after rain. But in a strange way this didn’t excite me. When we were naked like that, changing, showering amongst them, we weren’t really ourselves. We were lighter, without consequence. We took off our roles along with our clothes, and only belonged to the anonymous world of bodies. And when we swam our rounds and I pushed through the water, I felt even lighter. It reminded me of our summer together, of the ease with which we’d floated across the lake. As I swam I dissolved in the water, and something came to me from the depths of my memory.
In this novel which is set in the 1980's in Poland under the socialist regime, where homosexuality was socially unacceptable, the protagonist Ludwik (a university graduate) left Poland in 1981 to live in the United States of America. And he remembers what it was like back then in Poland, where he used to go to the university swimming pool at Warsaw with his lover Janusz.
In this part, I wonder what the boldfaced expression means. Would that mean the Warsaw University was surrounded by ramparts back then, and that the swimming pool was right under the ramparts when viewed from the sky, on the map? Or would it mean that the height of the swimming pool building was lower than that of the ramparts...? And, by "tucked in," does it mean that the swimming pool was stuck in below the ramparts? Also, would it be alright to understand that "faculty grounds" means the ground on which the university (for undergraduates) is built, rather than the ground reserved for professors...?
I am an English learner from South Korea, so thank you for your patience in advance as I may not know obvious things. I would very much appreciate your help. :)