A century ago, Niagara Falls was one of North America’s most important industrial power hubs. Beneath the waterfalls, engineers carved massive underground tunnels into solid rock to power factories, mills, and some of the world’s first hydroelectric plants. These hidden systems helped decide the War of Currents and proved that electricity could be transmitted across long distances. Today, most of those Niagara Falls tunnels are sealed, flooded, or forgotten. In this episode, we explore the aband