The image here is from Goat Island, just above and to the right of the previous image, which was from the tour boat Maid of the Mist. The view is in the same direction, and shows the Rainbow Bridge in the background behind the observation tower on the American side.
The description on the back of the card states:
NIAGARA FALLS, ONTARIO CANADA
As seen from Goat Island on the American side, showing Prospect Point and the American Falls, with the new Tower and the Rainbow Bridge in the background. The New Tower is 282 feet high.
–The New Tower is part of the Prospect Point complex, and is also the boarding point for passengers on the Maid of the Mist tours.
This card dates from the 1960s.