Another popular target is M33 — The Triangulum Galaxy. Although it is relatively bright and close to us (for a galaxy this large), its apparent size makes it a difficult target to pull from light polluted skies. Thus, even after 9 hours of exposure, the galaxy below appears as a pale imitation of how it looks under dark skies. Under the darkest skies, in fact, this can be a naked-eye object.
9 hours @ ISO 1600