Nördlingen, Germany

Hey all,
I’m out in Germany for a study abroad trip with my university, currently in Stuttgart, and we have an upcoming free day during the weekend. I recently found out that Nördlingen inspired Attack on Titan and was interested in seeing it in person.
I get one free day so I wanted to check out the city. What should be my plan when I get there? Is there anything that I should be on the lookout for? Has anyone ever been and what was your experience?