Barriers and manhole covers
And a couple of large construction dumpsters.
I had a very quick intro to Batman Miniatures Game the other day - a bit late for sure since I've got quite a lot of stuff for BMG but... better late than never. The only hiccup I see with it is the numerous special abilities that the characters have that will require constant book-reference during a game. The basic mechanics are simple enough though. I'm looking forward to a proper game.