Bebzol.com (EN) - Warsaw radio mast (646,38 m) was the tallest structure in the world until its collapse on 9 August 1991. http://9facts.co.uk/en/Warsaw -radio-mast-64638m-was-the-tallest-structure-.371.html | Facebook
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KVLY tower still stands tall - Grand Forks Herald | Grand Forks, East Grand Forks news, weather & sports
World of Engineering on Twitter: "This day on August 8, 1991 – The Warsaw radio mast, at one time the tallest construction ever built, collapses. https://t.co/m5q0W1bcbv" / Twitter
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