Treehouse Swing, Germany

Tree houses or tree forts are platforms or buildings constructed around, next to or among the trunk or branches of one or more mature trees while above ground level. Tree houses can be used for recreation, work space, habitation, observation or as temporary retreats. Tree houses are built usually by people for leisure purposes, also for protection from wild animals. In some parts of the tropics, houses are either fastened to trees or elevated on stilts to keep the living quarters above the ground to protect occupants and stored food from scavenging animals.   Source