The actual curvature is not directly visible from anywhere on Earth’s surface, not even from Mt. Everest:
Earth’s curvature can’t be visually seen from any location on the ground, even from Mount Everest. Studies show that the threshold altitude for seeing the curvature is about 35,000 ft (10,668 m). Even then, it’s barely discernible and the observer must have a wide angle field of view. Only aircraft flying much higher (commercial jets sometimes climb above 40,000 ft or 12,192m) offer an easy view of the curvature.
If you want to ask for the sort of indirect proof where the curvature works at obstructing some (part of an) object and/or stops doing so when you get to higher elevation…
Here’s an equivalent that doesn’t require your own motion at all (nor is the object moving, but it is "at sea"):
DanTysk offshore wind farm, seen from Rantum Beach, Sylt. [Germany] Camera was on top of sand dune, about 10 metres above sea level. Turbine blades are 60 metres long. hub is 100 metres high, About 80 metres of hidden height, clearly visible as the blades swing down and "through" the sea.
A somewhat similar view from Juist (also Germany), can be seen in this video. (The wind farm may be a different one.)
(My German isn’t good, but this video was amusingly/apparently posted by a flat-earther.)
Alas both of these require zoom optics or "20/20" eyesight, the windmills are tiny, tiny to the naked eye.
There are also some views that more or less are equivalent to a Bedford Level experiment, meaning they rely on a set of aligned objects of the same height. See this thread for a number of pictures of
transmission towers at Lake Pontchartrain, near New Orleans, Louisiana
Credit:stackoverflow.com‘
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