These are test instal­la­tions of the High-Volt­age Research Cen­ter of the All-Russ­ian Elec­trotech­ni­cal Insti­tute, which are locat­ed in the urban dis­trict of Istra. Peo­ple call them “Tes­la Coils”. Pre­vi­ous­ly, the com­plex was used to test var­i­ous objects for resis­tance to elec­tro­mag­net­ic fields. For exam­ple, to test the pro­tec­tion of air­craft from light­ning. The Arkadyev-Marx gen­er­a­tor is still in oper­a­tion, but the oth­er two facil­i­ties are aban­doned. Keep in mind that the area where they are locat­ed is closed and guard­ed, so get­ting inside will not be easy.