Koller Gallery
This charming little art gallery showcases contemporary works by Hungarian artists including Victor Vasarely, the leader of the Op Art movement. Everything you see here is for sale, including the sculptures in the beautiful garden out back. Climb the creaky stairs to the top floor for an exhibition on artist Amerigo Tot, who once lived here, as well as spectacular city views.
If the door is closed, it doesn't mean the gallery is; try ringing the doorbell.