Plock

From World travel guide

People interested in searching lostplaces should watch out, if there are some remanents at Gabin-Konstantynow of the Warszaw Radio Mast, which was situated at 52°22'14" North and 19°48'23" East and which was until now the tallest construction on earth. It collapsed on August 8th, 1991 at exchanging guy wires. It could be possible that there are still some relicts of basements and foundations as at the former Deutschlndsender site in Herzberg, Germany. A cool tip for amateur archaelogists!

http://en.structurae.de/structures/data/index.cfm?id=s0000672