I can't help with 3D versions, but you could try looking for photographs of Badajoz and Ciudad Rodrigo, in western Spain.   Their fortifications are in the Vauban style, well post-mediaeval, but the glacis was integral to city fortifications at least up until 1914.   Both cities were (rather notoriously) stormed by the British Army in the Peninsular War of 1808-1814.   I believe that their walls were repaired subsequently.   At any rate, they both have very splendid fortifications today and, especially because they were significantly involved in the Peninsular War, they are much photographed.

Just up the road from Badajoz is Elvas, which also has impressive fortifications.   Badajoz is in Spain, Elvas in Portugal - hence the thick walls.