Muslim women in abayas sit in rows on the expansive marble courtyard of Al-Masjid Al-Nabawi (the Prophet's Mosque) in Medina, Saudi Arabia, during evening prayer time. The mosque's iconic minarets and ornate exterior facade are visible in the background under a clear blue dusk sky. Al-Masjid Al-Nabawi is the second holiest mosque in Islam, originally built by the Prophet Muhammad (PBUH) in 622 CE, and remains one of the most visited pilgrimage sites in the world.