Antarctica is the clincher, for me. Admiral Byrd reported in the late 50s that there were a ton of resources there -- coal, oil, uranium, in vast expanses of mountain ranges.
So, why was the Antarctica Treaty then signed a few years later, barring any non-military expeditions? And at the same time, the US and Russian began throwing nuclear bombs into the sky -- to test the strength of the firmament?
You would think, in the intervening 60 years, that Shell, Exxon, BP, et al would have rigs down there, pumping resources out in order to enrich themselves.
That they're not there, is telling.
Whenever something is "classified", one can know that a conspiracy is happening. The definition of conspiracy is two or more people acting, with one or more people not knowing. Surprise parties, and the mafia, are evidence of conspiracies. (They don't always have to be negative, e.g., surprise party.)
I don't have all the answers, but I am learning about the proper shape of the world and my place in it.
The recent Red Bull dive, from 120,000 feet, briefly showed a flat horizon in the quick image from inside the capsule. Then all the images from outside the capsule were with GoPro cameras with wide angle lenses; the horizon is sometimes concave, sometimes flat, and sometimes convex, so can't be used to determine the shape (unless run through a filter which fixed the wide angle).
The horizon always rises to eye (or camera) level, even from that brief shot inside the Red Bull capsule. If the Earth were a globe, one should need to look down at the Earth as one rises.
One can see Chicago from 50 miles across Lake Michigan. At 50 miles, based on the astronomers' calculations for the curvature, it should be 50 * 50 * 8 inches below the horizon, or 20,000 inches, which is 1,666 feet (the Mason astronomers love to put 666 in their calculations ), and the tallest building in Chicago is the Sears Tower, rising 1,451 feet, so even that building shouldn't be visible. But the entire skyline was, and was not hazy/wavy like a mirage would have been (that weatherman couldn't keep a straight face, he knew he was fibbing).
 -- The tilt of the Earth is 23.4 degrees, they said. Sounds innocuous, yes, until one subtracts the angle from 90 degrees -- then, one gets 66.6 degrees.