Flat Earth has long been touted as the mother of all conspiracy theories, marginalized, suppressed and ridiculed for centuries as being an ignorant ancient unscientific worldview, but the facts of the matter are far from what you have been told. It is a fact, not a theory, that bodies of water always seek and find their own level, from a beaker, a bottle, or a bathtub, to a pond, lake or an ocean, the natural physics of water and other liquids is to find and remain level. It is an unproven, unscientific theory with no observable, measurable, or repeatable evidence, to claim that bodies of water can somehow bend, cling to the exterior of shapes, and show convexity upon their surface. It is a fact that the majority of Earth is covered in such level water, thus making it an unscientific theory to postulate that Earth is actually a gigantic sphere with bendy oceans curving all the way around it.
It is a fact, not a theory, that the horizon always appears perfectly flat 360 degrees around the observer regardless of altitude. All amateur balloon, rocket, plane and drone footage show a completely flat horizon as high as we can reach, over 20 miles, or 120,000 feet up. The only time the horizon ever bends is when viewed through a fish-eye lens or a curved commercial airplane window. It is also a fact, that the horizon always rises to the eye level of the observer as altitude is gained, so you never have to look down to see it. If the Earth were in fact a globe, no matter how large, as you ascended the horizon would stay fixed and the observer would have to tilt looking down further and further to see it.
It is a fact, not a theory, that we are able to observe objects at incredibly long distances far beyond what would be possible if Earth were a globe, 25,000 miles in circumference as we’re told. For example, it is a fact, that in Genoa, Italy, from just above sea-level, on clear days it is possible to see the distant islands of Elba, Gorgona, Capraia, and Corsica 80-125 miles away. It is a necessary theory that the globe-Earth must curve 8 inches per mile squared if it really be a ball 25,000 miles in circumference, but based on such a theory, these islands would all be completely hidden behind thousands of feet of curved Earth. In fact, the record-breaking longest distance zoom photograph ever taken recently showed Pic Gaspard from Pic de Finestrelles a whopping 275 miles away, at a height of under 10,000 feet, where, based on correct curvature calculations, the entire mountain should be invisible behind several miles of curved Earth.