Trinidad is a town in the province of Sancti Spíritus, central Cuba. Together with the nearby Valle de los Ingenios, it has been a UNESC…Trinidad is a town in the province of Sancti Spíritus, central Cuba. Together with the nearby Valle de los Ingenios, it has been a UNESCO World Heritage Site since 1988, because of its historical importance as a center of the sugar trade in the 18th and 19th centuries. Trinidad is one of the best-preserved cities in the Caribbean from the time when the sugar trade was the main industry in the region.