I just watched a documentary highlighting Mark Sargent and would welcome simple proof that the Earth is indeed flat. I grew up near Denver, Co and think it is an ideal location to do a simple experiment that would offer real evidence of flatness or roundness. It goes like this. Given adequate optics, if the world is flat then if a view point rises above the level of immediate object in line of sight then the furthest object that could be seen would be the furthest edge of the Earth. Right? At the very least there would be no difference between the furthest object from 150 ft in elevation and 500 ft. That is simple geometry.
Well, the Denver area has a very flat surface going East from the mountains and roads that go up adjacent mountains, which gives a great location for testing that simple geometry. So one could go halfway up Flagstaff mountain above Boulder and use a telephoto lens to shoot a pic due East. Then go up to the top of the mountain to another viewpoint and take another one. They should reveal the same most distant object if the earth is truly flat.
Even better, repeat the same experiment from the base of Pikes Peak, halfway up and at the top--12,000+ ft. up. That would erase minor undulations in ultimate flatness and offer some real, verifiable evidence of flatness if true and refute claims of flatness if there are significant differences in the furthest object that can be seen due to differences in elevation. Right?
I would do this if I still lived near the Front Range and submit my results, but sadly I moved away. As a photographer I have the equipment but surely many believers have similar equipment and opportunity. Even locations with space needles could offer similar experimental locations. Who is willing to take on this experiment and post the results?