How many space stations have we had and how much video exists of them being built?

I get why the world could be flat, but why no space? Its all land??? Why

Actually yes, in the Felix Bumgarner "space jump" the camera angle from the inside of his vessel, just before he jumps, shows the horizon to be perfectly flat. From the distance he was up in the air, you would be able to see a curve, even in the small frame from that camera angle. The evidence for this is from many different mathematically accurate CGI replicas if the earth, using all proper measurements. From these we can see what the curve is supposed to look like depending on how high up the vantage point is.