Doorway to another world...

My first blip for a while. When I saw today’s challenge my thoughts went straight to this doorway we found in our paddock when we bought our property. It’s a mystery. Why is it there? It stands alone but is concreted in. It has no purpose, and is in poor condition. Definitely derelict!

I think my future grandchildren will have some fantastic adventures through this doorway. Where do you think it leads?