So there are places around the country that are known for their physical galleries but they also have great online galleries that if you can't get there are almost just as good. I realize that I (along with most of the world) would rather see a piece in person than online, there's nothing like seeing a touching a piece in person and the great thing about the majority of ceramic galleries they let you handle to work! You really get a sense of a mug by holding it by the handle, feeling the weight of a plate or feeling the thickness of the wall of a bowl. In any case if you can't get to the galleries in person then online is the next best thing!
So if you have the chance and are in the area of any of these galleries you should try and check them out!