A huge, now aban­doned, anten­na sys­tem built in the 1970s as part of the Sovi­et anti-bal­lis­tic mis­sile ear­ly warn­ing net­work. It is a huge lat­tice megas­truc­ture with two anten­nas: the first is 150 meters high and 550 meters long, and the sec­ond is 80 meters high and 220 meters long. A small secret city was built to house the radar sys­tem, hous­ing 1,000 peo­ple. The struc­ture emit­ted a sharp tap­ping sound, earn­ing it the nick­name “Russ­ian Wood­peck­er”. It was so pow­er­ful that the sounds dis­rupt­ed legit­i­mate radio broad­casts and com­mu­ni­ca­tions around the world. After the death of a vis­i­tor who fell from the radar, all the lad­ders were cut down, mak­ing it vir­tu­al­ly impos­si­ble to climb to the high­er anten­na.