A popular defensive design in many Germanic Countries (going back to the 12th Century in some cases), Bridge Towers were fortified defensive structures constructed into a bridge or Crossway (over a river or related waterway). Their purpose was to provide protection or defense from attacking enemies that may attempt to overtake or damage an access point into a City or Town. The secondary function of The Bridge Tower was also to serve as a Toll Point (to collect passage or tax rate). Initially garrisoned by a small detachment of soldiers (in a defensive role), these structures could be wooden or stone constructions. In addition to their Germanic origins, there are many fine examples of Bridge Towers still in existence throughout Europe.