Needles Eye Tunnel, Needles Highway, Custer State Park, South Dakota

The Needles Eye Tunnel is a narrow passage carved through granite on the Needles Highway in Custer State Park, South Dakota. This road, part of the scenic Needles Highway, was constructed in the 1920s to showcase the park's unique geological formations, including the granite spires and pillars of the Black Hills. The tunnel itself was blasted through solid rock to allow passage for vehicles, becoming a distinctive feature of the park's infrastructure designed to enhance visitor access and appreciation of the natural landscape.