Midnight Hole is a natural stream pool on Big Creek in the northeast side of Great Smoky Mountains National Park, known for its cold water, boulders, and small cascade. It is a destination along the out-and-back Big Creek Trail from the picnic-area trailhead, not a roadside pullout. Mouse Creek Falls is about 4 miles round trip from the trailhead, half a mile farther along the same trail; that puts Midnight Hole at roughly 3 miles round trip. Treat the pool distance as an estimate, and come if a forested creek walk and uneven footing suit your day.