Gargoyles are decorative stone figures often found on buildings, particularly on Gothic architecture like cathedrals. They typically depict fantastical creatures, animals, or human figures and serve a practical purpose by directing rainwater away from the sides of the structure to prevent erosion. Originally, gargoyles were designed to be functional as water spouts, but they also had a symbolic role. Many believed they warded off evil spirits and protected the buildings they adorned. Famous examples can be seen on structures like the Notre-Dame Cathedral in Paris and the Sagrada Família in Barcelona.