The Medan Grand Mosque, officially known as Masjid Raya Al-Mashun, is a historical centerpiece in Medan, the capital city of the North Sumatra province in Indonesia. Built during the Dutch East Indies period, construction of the mosque commenced in 1906 and completed in 1909, reflecting the mix of Middle Eastern, Indian, and Spanish architectural styles. Characterized by its octagonal structure, the mosque is adorned with black domes and has an interior featuring marble, stained glass, and ornate decorations, showcasing a remarkable fusion of cultural artistry. It has a main prayer hall and a large courtyard. Medan Grand Mosque remains an essential place of worship for the Muslim community and is a popular attraction for visitors due to its historical significance and architectural splendor. Its presence testifies to the rich cultural and religious heritage of Medan and continues to promote Islamic art and education in the region.