Kingdom Builder: Capitol, a promotional item from Queen Games for Spiel 2011, consists of two capitol bulding tiles and rules.
If the game board sections with the harbor or oracle are in play, place a capitol building on one of the castles in that section. (If both are in play, you may use both capitols.) At the end of the game, you earn 1 gold for each of your settlements built within two hexes of a capitol.
For more information: http://boardgamegeek.com/boardgameexpansion/109141/kingdom-builder-capitol