Early modern mines were like subterranean roots from which fiscal-military states drew military, economic, and scientific power. To improve this vital trade, fledgling European mining administrations encouraged travelling officials to tour foreign territories to collect new useful knowledge. This website is the result of a three-year collaborative project between researchers at Uppsala and Stockholm University, which has used state-of-the-art digital methods to explore the collection of foreign knowledge of the Swedish Bureau of Mines through their system of study tours. Read more about the project