Was this presented story meant to be taken literally, or figuratively?
If literal, which appears more highly likely, then this may almost certainly suggest that the author assumed the world was flat - as the passage is assuming the entire "world's" kingdoms/villages/cities/other could be seen, simply by moving up higher.
"8 Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their splendor."
If one wishes to instead argue that such a statement has more of a figurative meaning, or maybe meant to suggest something other than the apparent straight forward assertion, then by all means... Please correct accordingly?
It's the simple passages above, which suggests that Bible author(s) did not have the foreknowledge to discern that the world was not flat. Nor, did Jesus offer correction of this now mundane piece of knowledge.
The point of this thread is to demonstrate, that aside from the Bible's proclaimed prophecies and miracles, where the Bible has a chance to demonstrate falsifiable data, such as the shape of the earth, the Bible sometimes gets it wrong.
And though many may want to 'knee-jerk', and reply that the Bible was never meant to be a 'science book', it looks as though the given passage above would a least present correct information. Or instead maybe omit Matthew 4:8 entirely?
The fact that the author elects to add such a passage, suggests that such a story is either completely false, made up, improvised, other; which begs a question.... What else is down right incorrect?
It's little nuggets like this, which makes skeptics, doubters, atheists, deists, etc. scratch their heads in wonder...