Clearly, He returns to the mount of Olives first, exactly where He departed from, and that even Zechariah 14:4 echoes this. But that doesn't mean He won't be globally seen as He is descending. Satellites and things of that nature would be capturing the event live and broadcasting worldwide.
Well, it could be, but it goes deeper than just a fully natural event. We don't know if satellites will still be working at that time, or even technology.
There is more to that verse.
Revelation 1:7
Behold, He is coming with clouds, and
every eye will
see Him,
even they who pierced Him. And all the tribes of the earth will mourn because of Him. Even so, Amen.
Heaven is opening up to the earthly realms, and that would include the dead who are in Hell. People are either on Earth, in Heaven or in Hell. When Christ returns everyone is witness, the living and the dead. He then gathers all to the judgment of the great Day.
The Parable of the Wise and Foolish Virgins - “Then the kingdom of heaven shall be likened to ten virgins who took their lamps and went out to meet the bridegroom. Now five of them were wise, and five were foolish. Those who were foolish took their lamps and took no oil with them, but the wise...
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31 “When the Son of Man comes in His glory, and all the [
c]holy angels with Him, then He will sit on the throne of His glory. 32 All the nations will be gathered before Him, and He will separate them one from another, as a shepherd divides
his sheep from the goats. 33 And He will set the sheep on His right hand, but the goats on the left.
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41 “Then He will also say to those on the left hand, ‘Depart from Me, you cursed, into the everlasting fire prepared for the devil and his angels: 42 for I was hungry and you gave Me no food; I was thirsty and you gave Me no drink; 43 I was a stranger and you did not take Me in, naked and you did not clothe Me, sick and in prison and you did not visit Me.’
44 “Then they also will answer [
d]Him, saying, ‘Lord, when did we see You hungry or thirsty or a stranger or naked or sick or in prison, and did not minister to You?’ 45 Then He will answer them, saying, ‘Assuredly, I say to you, inasmuch as you did not do
it to one of the least of these, you did not do
it to Me.’ 46
And these will go away into everlasting punishment, but the righteous into eternal life.”