If you'd like to get a bit into experimental rock, I highly, sincerely and definitely recommend Gentle Giant! You surely have heard their name, and for a reason - their experiments with music rock, they simply kick ass, although a bit hard to get into. I suggest you pay a few listenings to their Octupus album.
In the likes of Gruge giants Alice in Chains mentioned earlier, (which are also one of my favorite bands), I recommend checking out Mad Season, which is a supergroup with several members from famous Grunge groups, like AIC, Pearl Jam and more. They have only released one album, called Psycho Hotel.