Light up Different bat singnals locations outside of GOTHAM City is Fortnite X BATMAN Challenge or WELCOME TO GOTHAM CHALLENGE and I show ALL BAT SIGNAL LOCATIONS in Fortnite that are currently known!!
Use Code: NotBodil40
HUGE THANKS TO FORTTORY!
Their video: https://www.youtube.com/watch?v=wPBJN87UOoA
After more research I think the other picture was from HYPEX on twitter: