Pilgrimage to Makkah is the fifth pillar of Islam and it collects the attributes of all other pillars within itself.
It is the only pillar of Islam that has a surah named after it. The purpose behind hajj is great and its wisdom is immense.
Salaah is the first level of purification and elevation, to remind us of our slavery and our eventual standing in front of Allah SWT. Fasting is the second level of purification for those who might get rusty through the year and need an intensive routine of devotion and self sacrifice in order to renew their spiritual drive.
Zakah is an even higher level of purification by cutting off the love of material wealth from the heart by giving a portion of it to the needy of humanity. Hajj is the culmination of all these.
The main purpose of hajj is to go back to Allah SWT,
to detach one’s heart from everything
and devote oneself completely to Allah!
The magnitude of this journey can only be understood when one realizes who he is going to visit: The house of Allah SWT himself, on this earth.