Nowadays children mostly live within the four walls of their flats, houses and schools. Kids and teenagers spend most of the time inside because of, for example, city migration, lots of homework, development of technology, or parents’ fear against meeting bad strangers outside. Because of that, children are less and less acquainted with the nature and that may also render them less responsible for the environment in the future. There is much evidence that nature has lots of positive benefits on children’s psychological and physical development and well-being, such as reduction of stress, better health, better creativity and concentration. More free time and contact with nature could also positively affect children’s ability to focus in the classroom or to learn more effectively at home.