It’s center is medieval, called “Altstadtinsel” because it’s actually an island.
[https://whc.unesco.org/en/list/272/https://i.imgur.com/hhAoaVy.jpg](https://whc.unesco.org/en/list/272/https://i.imgur.com/hhAoaVy.jpg)
Edit: Apollo app on iPad failed to upload the photo.
https://preview.redd.it/adsf704bfoq71.jpg?width=4000&format=pjpg&auto=webp&s=f4c34a4f26ac8c4e13e29bfc55699241edd65a99