why the prayer should be facing the Ka'bah

Maybe we've been asking every time we do worship and second pillars of our prayers are always facing the Qiblah, or in this case the Kaaba. So why did actually have to face the Kaaba?
This is actually a history of the oldest in the world. Even long before humans were created in the earth, Allah Almighty has sent the angels down to earth and built the first house of worship where people. This is dituturukan in the Qur'an: Verily house originally built for humans, is the House that the Bakkah (Mecca) blessed and a guidance for all mankind. (Surah Ali Imran: 96).
It was said at the time of Noah as, this ka'ba had sunk and collapsed the building until the coming of Abraham with his wife and children to the barren valley with no water and there he found the foundations of the Kaaba and the building once stood. Then Allah commanded them to re-establish the former ka'ba on foundations first. And made the Kaaba as a place of worship was the father of three world religions.
And when We made the house (ka'ba) a gathering place for people and a safe place. And make some of the Station of Abraham a place of prayer. And We have enjoined on Abraham and Ishmael: 'Purify My house for those who thawaf people, who I'tikaf that ruku' and prostration ". (Surat). And proclaim to mankind to do the pilgrimage, they will come to you on foot, and camel riding skinny coming from all over the lot, (Surat Al-Hajj: 27).
At the time of Prophet Muhammad, prayers were initially ordered to Baitul Maqdis in Palestine. But the Prophet tried to continue to pray facing the Kaaba. The trick is to take up positions south of the Kaaba. With mengahadap to the north, then in addition to facing Baitul Maqdis in Palestine, he is also still facing the Kaaba.
But when he and his Companions emigrated to Medina, the two places facing the opposite direction becomes impossible. And the Messenger of Allah often looked up into the sky hoping to bring revelation to the Kaaba to pray. Descend until the following verse:
Verily, We see your face looking up at the sky, then indeed We shall turn you into a direction that you like. Palingkanlah your face toward the Sacred Mosque. And wherever you are, palingkanlah your face toward him. And indeed those who were given the Book did know, that turned into the Grand Mosque is the truth from their Lord, and Allah is not unmindful of what they do. (Surat al-Baqara: 144).
So in matters facing the Kaaba, Muslims have the background a long history. Kaaba is the first building erected on the earth to become the first human sanctuary. And Allah has determined that the prayer of a Muslim should face the Kaaba as part of the standard rules in prayer. (sa / eramuslim)