Al-Masjid an-Nabawi, or the Prophet's Mosque in Medina, is one of Islam's holiest sites, drawing millions of pilgrims annually. It's generally accessible, but during peak pilgrimage seasons like Ramadan and Hajj, crowd control measures are in place, potentially limiting access and requiring long waits. Visiting solo is common, but guided tours are available for historical and architectural insights. The cost is primarily for transportation and accommodation, as entry to the mosque is free. Visits typically last several hours to a full day, allowing time for prayer, reflection, and exploring the surrounding area. Note that non-Muslims may have restricted access to certain areas.