What is the black building in macca & why muslims go to hajj

The black stone building in macca is the building that was builded by Abraham & his son Ishmael _The father of arabs

It was the first house built to worship the One God…
Mecca is the spot where God sent Hagar and her suckling child to live….. a decade before the birth of Isaac
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Genesis 21
15 When the water in the skin was gone, she put the boy under one of the bushes. 16 Then she went off and sat down nearby, about a bowshot away, for she thought, "I cannot watch the boy die." And as she sat there nearby, she began to sob.
17 God heard the boy crying, and the angel of God called to Hagar from heaven and said to her, "What is the matter, Hagar? Do not be afraid; God has heard the boy crying as he lies there. 18 Lift the boy up and take him by the hand, for I will make him into a great nation."
19 Then God opened her eyes and she saw a well of water. So she went and filled the skin with water and gave the boy a drink.
20 God was with the boy as he grew up. He lived in the desert and became an archer. 21 While he was living in the Desert of Paran

The black stoned building in Mecca is called the Kaaba and it is located right beside the miraculous water well.
Muslim men and women can worship anywhere in the Kaaba Mosque complex and drink the Holy water at anytime of the day or night.
Muslims drink from this blessed water well and perform prayers in the holiest of holy places built by Abraham.

THE HOUSE OF BACCA ( MACCA ) IN QURAAN ( HOLY BOOK OF MUSLIMS ) AND IN THE BIBLE

QURAAN _AMIRAMITES
3:96 The first house established for the people is the one in Bacca; a blessed beacon for all the people.
3:97 In it are clear signs: the station of Abraham. Anyone who enters it shall be granted safe passage. The people owe it to GOD that they shall observe Hajj to this house, when they can afford it. As for those who disbelieve, GOD does not need anyone.
BIBLE _ PSALM84
4 Blessed are those who dwell in your house;
they are ever praising you.
Selah
5 Blessed are those whose strength is in you,
who have set their hearts on pilgrimage.
6 As they pass through the Valley of Baca,
they make it a place of springs;
the autumn rains also cover it with pools.

AS YOU SEE THE BOTH ************************S EITHER IN QURAAN OR IN BIBLE TALK ABOUT THE SAME THING WHICH IS THE HOUSE PRESENT IN BACCA .. BACCA IS THE OTHER COMMON NAME OF MECCA AND THIS IS THE HOUSE TO WHICH MUSLIMS TRAVEL FOR HAJJ.