The Omar Ali Saifuddien Mosque in Bandar Seri Begawan is a stunning example of Islamic architecture and a major landmark in Brunei. Visitors can typically explore the mosque's interior and surrounding areas in about 1-2 hours. Entry is generally free, but modest attire is required (headscarves and robes are often provided). Accessibility is relatively good, with ramps and elevators available. Solo visits are common and easily manageable, but guided tours can offer deeper insights into the mosque's history and significance. Note that the mosque is a place of worship and may have restricted access during prayer times or religious holidays. Photography is usually permitted in designated areas. It's advisable to check the official website or local sources for the most up-to-date visiting hours and any special regulations before planning your visit.