Porte des Degrés. The medieval walls and gates of Boulogne were build on the Roman ground plan of Gesoriacum.
| Creator: | Jan Hazevoet |
| License: | Creative Commons Attribution-ShareAlike 3.0 |
| Attribution: | |
| Added: | 2021-08-18 14:27:04 |
| Uploaded by: | Jan Hazevoet |
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