Holy

What makes a location Holy is the Divine Presence of God by Himself, His Son, or an angel. All three of those took place at America’s Mount Zion. Here’s the account:

1 AND now it came to pass that there were a great multitude gathered together, of the people of Nephi, round about the temple which was in the land Bountiful; and they were marveling and wondering one with another, and were showing one to another the great and marvelous change which had taken place.
2 And they were also conversing about this Jesus Christ, of whom the sign had been given concerning his death.
3 And it came to pass that while they were thus conversing one with another, they heard a voice as if it came out of heaven; and they cast their eyes round about, for they understood not the voice which they heard; and it was not a harsh voice, neither was it a loud voice; nevertheless, and notwithstanding it being a small voice it did pierce them that did hear to the center, insomuch that there was no part of their frame that it did not cause to quake; yea, it did pierce them to the very soul, and did cause their hearts to burn.
4 And it came to pass that again they heard the voice, and they understood it not.
5 And again the third time they did hear the voice, and did open their ears to hear it; and their eyes were towards the sound thereof; and they did look steadfastly towards heaven, from whence the sound came.
6 And behold, the third time they did understand the voice which they heard; and it said unto them:
7 Behold my Beloved Son, in whom I am well pleased, in whom I have glorified my name—hear ye him.
8 And it came to pass, as they understood they cast their eyes up again towards heaven; and behold, they saw a Man descending out of heaven; and he was clothed in a white robe; and he came down and stood in the midst of them; and the eyes of the whole multitude were turned upon him, and they durst not open their mouths, even one to another, and wist not what it meant, for they thought it was an angel that had appeared unto them.
9 And it came to pass that he stretched forth his hand and spake unto the people, saying:
10 Behold, I am Jesus Christ, whom the prophets testified shall come into the world.
11 And behold, I am the light and the life of the world; and I have drunk out of that bitter cup which the Father hath given me, and have glorified the Father in taking upon me the sins of the world, in the which I have suffered the will of the Father in all things from the beginning.
12 And it came to pass that when Jesus had spoken these words the whole multitude fell to the earth; for they remembered that it had been prophesied among them that Christ should show himself unto them after his ascension into heaven.
13 And it came to pass that the Lord spake unto them saying:
14 Arise and come forth unto me, that ye may thrust your hands into my side, and also that ye may feel the prints of the nails in my hands and in my feet, that ye may know that I am the God of Israel, and the God of the whole earth, and have been slain for the sins of the world.
15 And it came to pass that the multitude went forth, and thrust their hands into his side, and did feel the prints of the nails in his hands and in his feet; and this they did do, going forth one by one until they had all gone forth, and did see with their eyes and did feel with their hands, and did know of a surety and did bear record, that it was he, of whom it was written by the prophets, that should come.
16 And when they had all gone forth and had witnessed for themselves, they did cry out with one accord, saying:
17 Hosanna! Blessed be the name of the Most High God! And they did fall down at the feet of Jesus, and did worship him.

8 For I perceive that ye desire that I should show unto you what I have done unto your brethren at Jerusalem, for I see that your faith is sufficient that I should heal you.
9 And it came to pass that when he had thus spoken, all the multitude, with one accord, did go forth with their sick and their afflicted, and their lame, and with their blind, and with their dumb, and with all them that were afflicted in any manner; and he did heal them every one as they were brought forth unto him.
10 And they did all, both they who had been healed and they who were whole, bow down at his feet, and did worship him; and as many as could come for the multitude did kiss his feet, insomuch that they did bathe his feet with their tears.
11 And it came to pass that he commanded that their little children should be brought.

23 And he spake unto the multitude, and said unto them: Behold your little ones.
24 And as they looked to behold they cast their eyes towards heaven, and they saw the heavens open, and they saw angels descending out of heaven as it were in the midst of fire; and they came down and encircled those little ones about, and they were encircled about with fire; and the angels did minister unto them.
25 And the multitude did see and hear and bear record; and they know that their record is true for they all of them did see and hear, every man for himself; and they were in number about two thousand and five hundred souls; and they did consist of men, women, and children. (Book of Mormon | 3 Nephi 11)

1 AND now it came to pass that when Jesus had ascended into heaven, the multitude did disperse, and every man did take his wife and his children and did return to his own home.
2 And it was noised abroad among the people immediately, before it was yet dark, that the multitude had seen Jesus, and that he had ministered unto them, and that he would also show himself on the morrow unto the multitude.

4 And it came to pass that on the morrow, when the multitude was gathered together, behold, Nephi and his brother whom he had raised from the dead, whose name was Timothy, and also his son, whose name was Jonas, and also Mathoni, and Mathonihah, his brother, and Kumen, and Kumenonhi, and Jeremiah, and Shemnon, and Jonas, and Zedekiah, and Isaiah—now these were the names of the disciples whom Jesus had chosen—and it came to pass that they went forth and stood in the midst of the multitude.
5 And behold, the multitude was so great that they did cause that they should be separated into twelve bodies.
6 And the twelve did teach the multitude; and behold, they did cause that the multitude should kneel down upon the face of the earth, and should pray unto the Father in the name of Jesus.
7 And the disciples did pray unto the Father also in the name of Jesus. And it came to pass that they arose and ministered unto the people.
8 And when they had ministered those same words which Jesus had spoken—nothing varying from the words which Jesus had spoken—behold, they knelt again and prayed to the Father in the name of Jesus.
9 And they did pray for that which they most desired; and they desired that the Holy Ghost should be given unto them.

10 And when they had thus prayed they went down unto the water’s edge, and the multitude followed them.
11 And it came to pass that Nephi went down into the water and was baptized.
12 And he came up out of the water and began to baptize. And he baptized all those whom Jesus had chosen.
13 And it came to pass when they were all baptized and had come up out of the water, the Holy Ghost did fall upon them, and they were filled with the Holy Ghost and with fire.
14 And behold, they were encircled about as if it were by fire; and it came down from heaven, and the multitude did witness it, and did bear record; and angels did come down out of heaven and did minister unto them.
15 And it came to pass that while the angels were ministering unto the disciples, behold, Jesus came and stood in the midst and ministered unto them.
16 And it came to pass that he spake unto the multitude, and commanded them that they should kneel down again upon the earth, and also that his disciples should kneel down upon the earth.
17 And it came to pass that when they had all knelt down upon the earth, he commanded his disciples that they should pray.
18 And behold, they began to pray; and they did pray unto Jesus, calling him their Lord and their God.
19 And it came to pass that Jesus departed out of the midst of them, and went a little way off from them and bowed himself to the earth, and he said:
20 Father, I thank thee that thou hast given the Holy Ghost unto these whom I have chosen; and it is because of their belief in me that I have chosen them out of the world.
21 Father, I pray thee that thou wilt give the Holy Ghost unto all them that shall believe in their words. (Book of Mormon | 3 Nephi 19)