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An 18 mi road through open grasslands and hills, the preferred habitat for the park's large mammals. It's subject to frequent "traffic jams", when the park's herd of bison bumble across the road in no particular hurry.
At the end of a tunnel stands this granite spire, with a slit only 3-4 ft feet wide but reaching 30 to 40 ft in the air.
1.5 mi one-way. Hike to the base of the striking granite pillars along the Needles Highway. Connects to Little Devils Tower Trail.
1.5 mi one-way. Leads to a scramble of a rock with a steep cliff on one side, vaguely resembling the formation in Wyoming. Makes a loop with Trail #9.
3.3 mi one-way. The most direct trail to Black Elk Peak, the highest point in South Dakota at 7,242 ft. There's an impressive lookout tower and observation deck at the top. Makes a loop with Trail #4.