In a northern part of Bavaria, which is called Fränkische Schweiz, you can find the Durchgangshöhle Quakenschloß. It is located in a forest in the southwest of the community Engelhardsberg. A the norther exit of the cave you will find the arch.
It's dimensions: Span: 3,4 m; Height: 1,9 m.
UTM coordinates: 32U 664654 5517755