This is an old railway tunnel that goes from the river front under most of downtown Brockville, Ontario. It is possible to walk its length (under 1 km) at no cost, other than a donation, and they put on a pretty awesome light show as you walk through. At one point you hear a train whistle, the tunnel lights turn red and the sound of a train whooshes by.. The only problem is a slight climb at the far end to reach the exit from the park area. Definitely glad to have had the experience, though.
