The most artistic area? Well, in terms of artistry, the Spirit Temple, which someone mentioned. I just loved how it was organized, loved how everything fit together and was really in the mood of the area, and loved all of the mirrors. I think that it (along with the Fire Temple) was very well tied in with the plot.

MM was full of the points. The clock tower was great, and the ending sequence was great as well. I liked how they made the Happy Mask Salesman move, or jump around.