It's the place that was built by the father of all...

It's the place that was built by the father of all prophets (Ibrahim) peace be upon them and he called all humankind to preform Haj. It's also the place where the purest water on earth ( Zamzm)is. And the place where the prophet Mohamed peace be upon him was born in. The place where Quran ( Allah almighty words) was revealed. Indeed, this is the place which everyone should face when praying.