The same day I picked up the other owl at the salvy, I also found a copy of "Cathedral" by David Macaulay. His books are gorgeously illustrated guides to mechanics of architecture. I distinctly remember watching this movie version of the book during indoor recess one rainy fourth grade day. It really shows you the huge amount of patience and resources that went into creating these huge structures.
Gothic Architecture is my favorite sort. Gotta love the pointed arches, high ceilings and gargoyles.