Nestled in the picturesque Harpeth River State Park, north of Kingston Springs, Tennessee, lies the Montgomery Bell Tunnel, a testament to early American engineering ingenuity. Built in 1819, this historic water diversion tunnel is believed to be the first full-size tunnel in the United States, crafted using gunpowder and slave labor. The tunnel's significance extends beyond its age; it was designed to harness the power of the Harpeth River, creating a shortcut that leverages a 16-foot drop in elevation to drive industrial operations. Today, it stands as a National Historic Landmark, offering a glimpse into the region's industrial past amidst the serene beauty of the Harpeth River's meandering path.