Ladders and Buildings

I was standing on the roof of a tall building with 3 other people, two women and one other man.  The man was showing me how we had to climb up to the top of the building by using ladders.  I looked and the ladder went up the last few floors.  He explained we use the elevator then climb the ladder to get to the top.  He asked me if I would be more comfortable if the ladder was inside the building instead of outside. There was another building right next to the one we were standing on and he put a ladder going from our building to the building right next to us.  He then climbed up and went to the next building.  He asked me if I would feel better if the ladder had a cover so I didn't have to look down.  He put a triangle shaped cover over the ladder and one of the women started across.  While she was crossing the other woman climbed up the ladder on the outside of the building we were on and placed a ladder going to another building.  She crossed with no problem.  I looked around and all of the building had ladders connecting them together so it was possible to walk from one building to another by ladder.