Question

Each year, more than 2 million Muslims make a pilgrimage to which holy city?

Answer 1

mecca

Answer 2

Yes, the "pilgrimage" as you stated it, is actually called Hajj. The Muslims walk around the Kabah 7 times, and do their prayers. If you need more information on these Muslim processes, PM me. I am a Muslim myself, so I have learned about these my whole life!