The Needle's Eye Tunnel is a narrow rock tunnel located in the Black Hills of South Dakota. It was carved through granite and is part of the scenic Needles Highway, which offers stunning views of the surrounding landscape. The tunnel is approximately 8 feet wide and 9 feet high, making it a unique and popular attraction for visitors. Constructed in the early 20th century, the tunnel was designed to allow vehicles to pass through the rugged terrain. It is named for its resemblance to the eye of a needle. The Custer State Park nearby provides opportunities for hiking and wildlife viewing, enhancing the overall experience for tourists.