The Well of Welcome is a special building which was first given as a promotional registration reward for a period of time in 2012.
Players already registered to Forge of Empires were re-invited to the game and they could receive the Well of Welcome as a welcome back gift. It has reappeared later as a reward during some events.
The Well of Welcome provides happiness. When the Well of Welcome is polished its output of happiness is doubled for 12 hours.