Outpost (Age of Empires II)

The Outposts are available during the Feudal Age and they are very cheap, costing a mere 25 Wood and 10 Stone. They have no attack, and are used specifically for their vast line of sight, which increases with every age, and technologies Town Watch and Town Patrol, both researched from the Town Center. Computer-controlled players often attack these buildings first, as they are usually on the fringes of a player's territory. They are a type of defensive structure, that can be built by every civilization, as can Palisade Wall.