The Trojan Horse is a building, which serves no use beside decorating the Capital City. It can be obtained from the quest "Horsing Around", where you defeat Troy. It can not be traded, and therefore you can only own 1 of this building.
Upon building the decoration you will receive the "I HAS A HORSEY" achievement worth 40 Gamer points.
- The Trojan horse is a direct allusion to the Trojan Horse of Legend supposedly used in the Siege of Troy. Players Re-enact the supposed use of the Horse during the quest that rewards this item.