I visited this lovely lighthouse in Calais. They liked to practice English there so when I asked if we were allowed outside on top the lady said slowly:
"You walk up to to door, you open the door, and you walk outside."
To which we replied "Merci."
You can see this lighthouse from Dover England.
It was rather a simple building as you can see from this fire escape and extiguisher diagram. Most of it is a giant sprial staircase.
In case of Emergency though, you can never be too safe, each floor had a helpful sortie sign pointing straight down (I circled them red). I don't think it can get more ridiculous, the only thing burnable on these floors are the plastic exit signs!