Editor's note: If you simply organized your travel plans around seeing fantastically-beautiful cathedrals, you’d end up with an amazing itinerary: Moscow, Paris, Mexico City, Ecuador (gotta see those gargoyles in the form of iguanas), Florence, New York City, and of course Milan. Like the pyramids, some cathedrals took centuries to build, and most of those who poured their souls into the construction never got to see the final result. Show your appreciation with some stunning Cathedral wallpapers!