Millions of pilgrims make the annual journey to Mecca from around the world to complete Hajj. Demonstrating the solidarity of all Muslims and their submission to God, Hajj is a key tenet of Islam.

This year, Hajj started on Sept. 21 and continues until Sept. 26. Here are some of moments captured by pilgrims and shared on Instagram.

This little fella got some help from his dad

And this little guy needed a rest

Everyone joins together in unity

And we are talking about a lot of people

Like really, a lot of people!

And of course there are the selfies ...

Even the occasional selfie stick makes an appearance

And normal group photos are cool too

Couples can experience the Hajj together

And the strong help those who are not so strong