Landmark Plaques are used to mark noteworthy structures and allow players to vote on those they like. The number of votes is displayed on the plaque.
Landmark Plaques will mark the location on a map, unless the title space is left blank. If the title is left blank, however, players will still be able to vote.
Players can only vote one time per plaque and must wait before being allowed to vote on another plaque. The amount of time you have to wait depends on how many other times you have voted. The more times you've voted on other plaques, the less time you have to wait between voting. The maximum amount of time required between votes is 24 hours; the least possible time is 3 hours.