I plan to reject these two, as I think they are (former) city gates not strict triumphal arches:
- Trier Porta Nigra
- Istanbul Golden Gate
And one I'm in doubt about:
Vienna Hofburg Outer Castle Gate (I know it's mentioned in Wikipedia but what is it) ???
-> is this the red-black Swiss Gate? and is that a gate or a triumphal arch?
If I'm wrong, please tell me and show some form of 'proof'