Hajj
 

Hajj is the big opportunity of Muslim Umma. Because it is on of the pillars of islam. Allah told "And when you have completed your rites (of Hajj)then remember Allah as you remember your forefathers ; nay with a more vigorous remembrance". At the center of the Islamic religion lies the Ka'ba. Uniting the aspects of the divine beauty and the divine majesty.it is the right place of muslim Umma for prayers.

I too have heard about Hajj, it is a very important aspect of Islam and yes there are a lot of responsibilities attached to it too.