The highest tower in Europe (radio mast in Gąbin/Konstantyn�w, Poland; in 1974 was over 646m high which was half of radio LW length) collapsed during renovation work in 1991. I didn't see any information about it at most popular sites devoted to world tallest structures.
More detailed information about that construction can be found (in Polish) at
http://www.radioam.net/ciekawe_artykuly/maszty_1pr/
or (in English) at
http://en.wikipedia.org/wiki/Warsaw_radio_mast .
Highest tower ever crushed
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