The Şehzade Mosque in Fatih

You're standing at the Şehzade Mosque, the Prince's Mosque, on the third hill of Istanbul. The name gives it away: this is a memorial to a prince. In 1543, Sultan Suleiman the Magnificent lost his favourite son Mehmed, who died on his way home from a victorious campaign in Hungary. Mehmed was being groomed as the next sultan. The story goes that Suleiman mourned for forty days at his son's temporary grave. On that very spot, he had a whole complex built.