This has once been a great and huge shed. Even the ruins in the condition they are in at the moment are impressive, at least to me. After marveling it from the ceiling I walked inside and what did I see, have a look at the large perspective, details will follow.
Ritva Sillanmäki Photography 
Be careful there, Ritva!
Thank Lois, I was, the floor was in many parts covered with broken glass, but fortunately I had sturdy shoes on.
Marvelous!