Which structure in germany became one of the most significant symbols of the cold war

The Correct answer is "The Berlin wall".

Explanation:

The Berlin wall 1961

The United States won't be going to leave its troops from Germany so the Soviet Union decided to build the Berlin wall.So In 1961, West Berlin was covered by East Germany with barbed wire.This was gradually built into the Berlin wall and access to East Berlin was very strict.However, On November 1989, the Berlin wall was flooded with both sides of the people and this will result in the fall of the Berlin wall with the East communist party.