Orissaare stadium is unique not only in Estonia, but the entire world. The reason for this is a mighty oak standing in the middle of the stadium.
While the stadium was being built, the Soviet technology could not beat the oak, and therefore, it was never uprooted. Today, everyone is so used to the 'extra-player' on the field that the tree is hardly noticed during games.
The oak achieved Europe-wide fame in the beginning of 2015, when it won the title of the European Tree of the Year.