- Niagara Falls has been a magnet drawing global travelers for at least two centuries.
- The rocks beneath the gigantic triple waterfall that straddles the border between the US state of New York and Canada’s province of Ontario are honeycombed with chambers carved out to harness the powerful forces of thundering nature overhead.
- And now, a 670-meter (2,198-foot) tunnel built over a century ago on the Canadian side has been opened to reveal the incredible scale of these engineering marvels.
