^^^ LOL you can't even see to the end of a long enough hallway. It's called perspective, look into it.
Perspective, the same reason why sun rays converge to a single point in the sky.
https://i.imgur.com/WRnRAH6.png
It is explained quite easily here: https://physics.stackexchange.com/questions/154951/why-do-sunbeams-diverge-even-though-the-sun-is-much-more-than-a-few-kilometers-a
In the train tracks image (above url) the rays in the back are pointing away from the viewer and diverging. While this seemingly debunks the parallel Sun rays diverging due to perspective hypothesis, the fact is the clouds are creating an aperture and the light is being projected from that point causing most of visible divergence.
That url just muddies the water with a bullshit explanation in support of a globe. The reality is its an aperture projection that doesn't prove either a globe or a flat plane.