Boing Boing, the popular blog, had a posting recently about “Niagara Falls’s secret tunnel“:
The Vanishing Point, a site dedicated to urban exploration and secrets of the built environment, has a page about the massive abandoned Tailrace tunnel at Niagara Falls. (The entire Vanishing Point site is mesmerizing, rich with great writing and fantastic photography.) Part of the decommissioned Toronto Power Co. hydroelectric plant, the tunnel is ten stories underground and only accessible through a hidden slit in the ceiling.