Because Muslims are encouraged to pray in congregation. Prayer is made very easy in Islam, so that a person can pray whenever and wherever he wants. He just needs to have a clean space enough to stand and bow down.
A popular photo project celebrates the unexpected places Muslims pray: the basketball court, an airport baggage claim, the beach, and Machu Picchu.
For the past 2 years, American Muslim photographer, Sana Ullah has been documenting Muslim prayer.