As to be expected, like in urbandreamer's post, in the more elevated parts of the rural GTA, you can see Mississauga or Toronto.
When you drive this area of Caledon, there are several spots along the road where you can view either city while driving. This house was listed for $5m based on the fact that you can see both skylines, way off in the distance, from the backyard. No idea if it ended up selling anywhere near that. I woud hope not. And I'm guessing the listing didn't mention it's located next to a giant quarry.
For $5m, you would think it would be for the land and someone would build a palatial estate on it. But this house looks fully reno'd. But, there are some people who wouldn't think twice about knocking it down and re-building. I read once that Caledon has the most millionaires per capita so who knows.
And keep in mind, when you see professional pics like these, or from amateurs, using a telephoto lens, shooting skylines or mountains, etc., it is not that impressive in real life as the lens is making the background closer and larger. Just like fall pics with the colours or wedding pics in nature or in a rustic barn, etc, a lot of filters or tools being used, which is part of the artistic aspect of photography.
From:
https://www.blogto.com/real-estate-toronto/2021/12/17537-hurontario-street-caledon/