Upon its completion in 1974, the Warsaw radio mast in Poland became the world’s tallest structure. Standing 2,120 feet (646 m) tall, the tower was used for long-wave radio broadcasting. In 1991, the mast underwent repairs to exchange guy wires, the cables used to stabilize the tower. However, the mast bent and then snapped at approximately half its height. It was never rebuilt. What became the world’s tallest structure upon the Warsaw radio mast’s collapse? Discuss