Ruin

Ruins are building that may appear on land or on sea. When a unit is placed on a Ruin, a bonus will be earned at the begining of the next turn. The outcomes of the exploration are:
 * A Guardian will spawn (land guardians only spawn on land)
 * A random Tech will be researched for free
 * The development of your Capital increases (+3)
 * A quantity of Gold is earned (+15)
 * Player's Sight is increase (+2)
 * A Battleship will spawn (Water ruins only) (replaced by Flying or Amphibious guardian)