an outdoor saltwater pond is very unlikely for any place unless completely protected from the elements. There would have to be no way for moisture to get into the tank(rain, snow etc) but a filtration system that would allow for surface air to allow gases to escape. It would probably be about 10 times as much spent on an outside aquarium, because Ohio's summers haven't been so cool and a chiller to cool down such a tank would be a major expense. Not to mention the sun cover could cause huge outbreaks of all types of algea. A top view would not be very useful because of the ripples of the water as well. Most fish look great from side views, not from the top.
With all of that said, it is possible, but much more expensive and more time consuming with little appeal. I would suggest getting a 300 gallon inside tank, and I would suggest keeping it from windows unless you want to scrub algea off your tank.