Wishing Well provides a random surprise every 24 hours. It can award one of the following: 50 diamonds (very rare), 2 forge points, 10 goods of current age (20 unrefined goods for ME and above player), or an amount of medals, coin, supply that is based on your age. It is one of the few event buildings that will advance with the player's age. Some say it is worthless use of a 3x3 space but I like mine.