The Indonesian island of Sumatra is the sixth largest island in the world. The rich ethnic diversity and historical heritage in Sumatra is reflected in the range of architectural styles in the island. The vernacular style is the native Sumatran ethnic groups architecture of dwellings, while the Hindu-Buddhist architecture reflected through the cultural historical heritage of candis built in Sumatra. The third wave is Islamic architecture adopted in mosques and palace in Sumatra, especially in Aceh, North Sumatra, and Malay cultural sphere in the island.