Folks, thought I would chime in here:
Flying over the falls, even in an RC aircraft, is essentially illegal below 3500ft ASL. Flying above that, you must announce your entry into a defined pattern over the falls, and follow VFR rules (which you can't do with your phantom)
It is called the Niagara Falls Flight Restrictions Area, and in Canada the rules apply to both civil and model aviation.
The appeal of the Falls attracts many aircraft, but not the least of which are the high volume of sightseeing helicopters in the area. There are helipads on both the US and Canadian side less than a mile from the falls. Each have a set pattern to follow, and expect free airspace (this extends from a midair collision many years ago).
To operate your drone in this area will get you a talking to at best, or criminal charges at worst. You can also face fines from Niagara Parks if you crash your drone into the falls (up to $10,000).
This restriction is in place for all aircraft from 0 to 3500 ASL. Again, Transport Canada does not give any special authority to remote controlled aircraft at any altitude, but offers guidelines for safe operation in other areas. Those guidelines do not supersede the flight restrictions in effect.
Similar restrictions are in effect on the US side as well.
If you wish to fly over the falls, contact Transport Canada to obtain permission first.
Fly safe.
https://www.tc.gc.ca/eng/civilaviation/publications/tp185-3-10-regulations-5827.htm