Most mosques are open to the public daily. They usually welcome visitors, but non-muslims should not enter the mosque during regular Friday services. When visiting a mosque: Dress modestly. For men, that means long trousers and covered shoulders. Likewise women must dress with shoulders and knees covered, and don a head scarf as well. Remove your shoes and leave them at the entrance. Retrieve them when you exit. There are often designated racks onto which to drop your shoes. If non-muslim, do not enter during prayer times. Consult the daily prayer timetable for details.