This old tree has a wall inside.
The tree is really old, around 200 years old. It started to grow in German city Koenigsberg, inside a brick fence. German owners of the house let it go and it was growing like that leaving the fence inside of its roots and .. .
On this old photo 80 years or so ago, this tree can be seen marked with the arrow.
Later during WW2 there were severe battles in this city, and after the war it’s got under the Russian powers and was renamed to Kaliningrad.
The fence and the house were totally destroyed.
But the part of this fence can still be found inside the tree.