In 1563 Denmark conquered the Swedish Elfsborg Fortress, and made Sweden pay a ransom to get back. In 1612 Denmark conquered the Fortress once again, and had Sweden pay another ransom to get it back.
An open air school in 1957, Netherlands ⣠In the beginning of the 20th century a movement towards open air schools took place in Europe. Classes were taught in forests so that students would benefit physically and mentally from clean air and sunlight.