This post is probably only on local interest, but Billy Penn has an article on all the carvings on Philadelphia’s City Hall, which is also the world’s largest free-standing masonry structure. That is, this is about as big as you could build a building out of stone, before concrete and steel are invented. Like most things in Philadelphia, it is poorly maintained, underperforming and underwhelming. This may have something to do with the gargoyles inside the building.