Visitors to Niagara Falls have a new way to experience the iconic triple waterfall. Travelers can now wander through a massive, century-old 2,200-foot-long tunnel located 180 feet beneath the historic hydroelectric plant that once converted the roaring waterfall’s powerful whitewater into electricity. The tunnel opens to a 65-foot, river-level viewing platform that offers a spectacular front-row seat to the gushing flow of Horseshoe Falls, the largest of Niagara's three flows.