Badlands National Park is full of geological oddities, but the 1.5-mile-round-trip Notch Trail is one of the best treks in the South Dakota park. There's something distinctly eerie about the Badlands.

From October 1 to April 30, it is open from 9 a.m. to 4 p.m. A smaller seasonal facility is in the South Unit of Badlands ... Hiking trails, off-road and wilderness biking aren’t permitted.