At the Bellerophon grave. Note: NOT the grave of this mythical hero, but a grave with a representation of a man riding a winged horse.
From the Wikipedia: Bellerophon (Βελλεροφῶν) or Bellerophontes (Βελλεροφόντης) was a hero of Greek mythology. He was "the greatest hero and slayer of monsters, alongside of Cadmus and Perseus, before the days of Heracles", and his greatest feat was killing the Chimera, a monster that Homer depicted with a lion's head, a goat's body, and a serpent's tail: "her breath came out in terrible blasts of burning flame."
One part of his myth then is: The Lycian seer Polyeidos told Bellerophon that he would have need of Pegasus. To obtain the services of the untamed winged horse, Polyeidos told Bellerophon to sleep in the temple of Athena. While Bellerophon slept, he dreamed that Athena set a golden bridle beside him, saying "Sleepest thou, prince of the house of Aiolos? Come, take this charm for the steed and show it to the Tamer thy father as thou makest sacrifice to him of a white bull." It was there when he awoke. Bellerophon had to approach Pegasus while it drank from a well; Polyeidos told him which well—the never-failing Pirene on the citadel of Corinth, the city of Bellerophon's birth. Other accounts say that Athena brought Pegasus already tamed and bridled, or that Poseidon the horse-tamer, secretly the father of Bellerophon, brought Pegasus, as Pausanias understood. Bellerophon mounted his steed and flew off to where the Chimera was said to dwell.