In what city is the holiest shrine in the Islamic religion located?

well when we say 5 pillar of Islam we rae speaking Figuratively :)

the 5 pillars of Islam are :

1. to believe that there is Only one God who is Allah and that Mohammad is his Prophet

2. Praying

3. A zaka " to give money ti the poor on specific amount"

4. Fasting in the holy month of Ramadan

5. Hajj for only who can afford it phsicaly and money wise

those are the 5 things that one has to believe in and do to be a Muslim ofcourse plus many other things but those are the PILLARS taht Islam stand on