Thank you for the link.
The famed Kaaba.. I would like to go there someday.. soon, I will be able to afford to go there..
Prayer and Worship, as I have learned from Sufi is not for God but for us humans. In times that we are idle, we must pray and worship Allah to keep our selves pure of sin, and keep us away from temptation.. because when we are idle, temptation easily comes into our minds. By far, that is the best purpose I have learned for prayer and worship.

Of course, if we are busy with everyday work, prayer and worship is set aside so that we can focus on our duties as responsible beings.