In Animal Crossing
The Lighthouse appears in Animal Crossing for the GameCube. In this game, it is located near the water and turns on when it begins to get dark. Once a year, during Tortimer's Vacation, Tortimer will ask the player to turn on the lighthouse every night between specific times for seven consecutive days. This is also the only time the inside of the Lighthouse can be seen. If the light is turned on each day, Tortimer will reward the player with a model of the Lighthouse. However, if the player misses even one day, he won't give any reward.
In Animal Crossing: City FolkThe Lighthouse is the final landmark that is obtainable in Animal Crossing: City Folk through the town fund by donating 1,000,000 Bells. The player will vote on building either the Lighthouse or the Windmill. The lighthouse is purely cosmetic and has no effect on gameplay. Interestingly, once installing a Lighthouse, the chances of rare fish appearing will increase.
Animal Crossing: New Leaf
The Lighthouse returns in Animal Crossing: New Leaf by as a Public Works Project, costing 372,000 Bells. It can be requested by any type of villager. Only one Lighthouse can be constructed, and it may only be placed on land, not on the beach. Note that this Public Works Project is not available from the beginning and will not be available until a villager requests it.