The Crooked Forest, known in Polish as Krzywy Las, sits near the town of Gryfino in western Poland. It holds roughly 400 pine trees whose trunks bend sharply at the base before curving back upward. The trees were planted in the 1930s, and the cause of the distinctive curvature remains unexplained.
They used to plant and shape trees for use in building wooden war ships. A few years ago a strand of oaks in France matured to where they could be used. That is not what is going on here, but maybe for some other purpose.