I love 3D dungeon terrain, don't you? Course you do!
Well I've recently discovered a German company called Thomarillion
who do a nice selection and for reasonable prices too. Here's some pictures stolen shamelessly from their website:
^ some pictures of the basic set
^ Library furniture
^ "Enchanted Mirror"
^ a Cupboard
^ Dwarf Throne
^Cages, made from die-cut cardboard apparently
^ The Twilight Inn, ok it's not a dungeon, but imagine the kinds of adventures you could run!