Where does this come from, and can I check it?

Completed in 1974, it was the tallest structure ever built until it fell in 1991. The figure is taken from Guinness World Records, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a records & extremes fact?

Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The Warsaw radio mast stood 646 metres tall

Completed in 1974, it was the tallest structure ever built until it fell in 1991 The guyed mast at Konstantynow in Poland reached 646.38 metres, taller than any building or tower raised before or since. It carried a long wave broadcast transmitter and was held upright by cables anchored to a ring of concrete blocks. It collapsed on 8 August 1991 during maintenance work, and no structure has exceeded its height since. It sits in Mondo's records & extremes collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Guinness World Records

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: towers, poland, engineering

The Warsaw radio mast stood 646 metres tall: the short answers

Where does this come from, and can I check it?: Completed in 1974, it was the tallest structure ever built until it fell in 1991. The figure is taken from Guinness World Records, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a records & extremes fact?: Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.