A Redditor exploring the streets of Ronse, Belgium stumbled across an amazing secret art gallery inside an abandoned nursing school were walls full of Batman graffiti dedicated to Batman and the Joker and others from the DC universe. The Redditor, sneakylawyer, says the school has been abandoned for about a decade — plenty of time for it to be reclaimed by an enterprising artist. The Batman graffiti is the work of Pete One. You can see more of his work via his online gallery.