Here's one walking the tunnel system in Journey Behind the Falls
Below are 3 videos of the White Water Rapids (Class 6) of the Niagara River
My all time favourite, Niagara's Canadian Falls with the view of Maid of the Mist from above. This was taken from the Table Rock view and during the time this was taken, there was a magnificent rainbow around the Falls.
Here are other vids. Here's one of how they make candy. This was taken in the Welcome Center.
And here's one of how they made caramel. This was taken in Clifton Hill area in one of the candy shops.