The highest tower in Europe (radio mast in Gąbin/Konstantynów, 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 .

[Dylan Leblanc]

We have that right here: http://skyscraperpage.com/cities/?buildingID=6443

However, we have a slightly shorter height fome some reason!