The gargoyle was primarily used in architecture to serve as a spout to throw away rainwater from a building. These grotesque creatures were usually carved out of granite and were quite useful in minimizing damage to the roof of a building from a rainstorm.
Along with diverting rainwater, this sculpture was also used by churches to scare people and make sure they stayed away from evil. Basically, these creatures were meant to tell the illiterate people that if you don't go to church or indulge in evil behaviors, the gargoyle will get you.
Some people even used the gargoyle as a way to ward off evil spirits and bad luck. Yes, the creature may be grotesque but it can help keep you safe too.
However, these days, gargoyles have basically become ornamental and people often use these as a decoration item in their homes or lawns. So, if you are fond of this little monstrous creature, why not pick one for your home too. Take a look at some fantastic gargoyle sculptures right here.