//
Moderate 10 mi round trip. This is the longest trail in the park. The trail is mostly level and winds through some formations. The Medicine Root Trail makes a loop within the Castle Trail from any connecting trailhead.
The main facility in the North Unit, with exhibits on wildlife, geology and paleontology. The Badlands Natural History Association operates a shop with educational materials for sale. Bus and RV parking is available.
Features the brightly-colored yellow rock layer, one of the oldest layers in the park.
A view of the marginal White River Valley farmlands that homesteaders tried to make work in the late 1800s.