there aren't many in Transylvania.

Quality over quantity! I love coming across graffiti/murals. A few years back it had become my hobby to go find hidden graffiti. But as many as we have here, they are not close to how excellent the graffiti you came across. The murals here are a different ball game.

I am not very good with the terminology either, but my guess is murals are large pieces of art that are painted on walls and graffiti is usually illegal.