According to legend, old oaks in the park were planted by the mother of the first Russian emperor Peter the Great.
During World War II, almost all of them were cut down in order to heat the hospital. This oak is one of the few remaining. So he looks after a lightning strike. The crevice was flooded with cement to save the tree from decay. But time passed and the cement collapsed, but everyone forgot about the tree.
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From @alexgraal