Gargoyles were built into the ends of gutters to drain rainwater off the roof. The gargoyles extend far off the side of the roof to prevent any water damage from occurring to the walls. I thought they were there for hundreds of years, but something I read said they were built in the 19th century. (Not too sure about the accuracy of that.) I also heard there are around 5,000 gargoyles placed throughout the entire building! Now that’s alotta’ gargoyles!