Retiro Park, the large open green area in Madrid akin to Central Park in NYC, contains quite a few fountains including one that is known as the fountain of El Angel Caido, the Fallen Angel.
Many folks believe that the fallen angel is a depiction of Lucifer at the moment he has been cast from heaven. Some go as far as saying that this fountain is a monument to the devil, but I'm guessing with the Catholic tradition of Spain, it is much more of a warning about what awaits in hell.
Just take a look at these water spewing gargoyles awaiting the angel at the base of the fountain. They do not seem to be the most welcoming group to greet the fallen angel that will presumably be their new boss.