intresting to see this old fortress , we have cities build like that in the past here in Holland .
Like Naarden https://maps.app.goo.gl/Gkkqm1iirS1yuaCcA and Brielle https://maps.app.goo.gl/nhdqvveEUT9LuiaLA

found a dutch website it seems we have like 160 cities like that from the past https://www.skyscanner.nl/nieuws/mooiste-vestingsteden-nederland