Some examples of Wilderness and Border land buildings:- Note that these 'packages' are slightly cheaper that if you were to custom build them.

Redoubt - A small, hidden, stronghold.

Frontier Fort - Infantry - used to establish a foothold in the wilderness or to use as part of an early warning system for your holdings.

Frontier Castle - A secure home for The Borders or Wilderness, which adds to your holding's defence.

Small Cavalry Fort - houses a single unit of cavalry.

Settler Hamlet - A small fortified settlement for new, ground-breaking, settlers.

Strong Keep - one of the most expensive, and effective holdings for a border or wilderness lord,