(Mecca/Medina)
The fifth pillar of Islam is a pilgrimage to

The fifth pillar of Islam is a pilgrimage to​ Mecca

Explanation:

The five pillars of Islam are the five basic tenets by which the Islamic people function and live their lives in religious terms

These include their praying habits and general habits that would apply to all of their life and not just the time of their prayers.

The last and the rather most outlandish of this is Mecca which is their holy pilgrimage.

Whoever, it is allowed for some one who cannot go to Mecca to not go and do penances for the people that can go to Mecca.

So it is not absolute compulsion.

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explanation: