In the dictionary, The preposition "around" means "on or to another side of something".
For example, "There's another door around the back of the house."
So that sentence means "There's another door on the other side of the back of the house."
"The back of the house" has just 1 side, where is the other side of the back of the house?
Or does it mean "there's another door on the side of the house"?
That is very confusing!
Say, you are standing on 1 side of a corner and you say "the elevator is just around the corner" which means you go to the other side of the corner.
And "the back of the house" is a straight line and has no corner.