Take a lift 45 metres (150 feet) to the ground level, where a short tunnel leads to two outdoor viewing decks and two portals that are situated just behind the Falls. You can witness the breathtaking spectacle of one-fifth of the world's pure water rushing down to the basin below at Journey Behind the Falls. Over 2,800 cubic metres of water, moving at a speed of 65 km/h, roar over the edge every second during the warm daytime hours