The Industrial Revolution came to Asturias after 1830 with the discovery and systematic exploitation of coal mines and iron factories at the mining basins of Nalón and Caudal. At the same time, there was significant migration to the Americas (especially Argentina, Uruguay, Puerto Rico, Cuba and Mexico); those who succeeded overseas often returned to their native land much wealthier. These entrepreneurs were known collectively as 'Indianos', for having visited and made their fortunes in the West Indies and beyond. The heritage of these wealthy families can still be seen in Asturias today: many large 'modernista' villas are dotted across the region, as well as cultural institutions such as free schools and public libraries.