What made all these trees in Poland crooked?
From gravitational forces to military tanks, the theories behind the Crooked Forest, located in Krzywy Las, Poland, are truly something else.
The forest includes about 400 pine trees with a 90-degree bend, most curving north.
Bizarrely, it is surrounded by a bigger forest, where all the trees are completely straight.
The trees are thought to date back to the 1930s, and something altered them around 10 years later.
But what was responsible?
Find out more in the video above.