Yerevan TV Tower (, Yerevani herustaashtarak) is a high lattice tower built in 1977 on Nork Hill near downtown Yerevan, Armenia. It is the tallest structure in the Caucasus, fourth-tallest tower in Western Asia (The Milad Tower in Tehran being the tallest), sixth-tallest free-standing lattice tower and thirty-eighth-tallest tower in the world. Construction In the late 1960s it was decided to replace the -high TV tower in Yerevan due to the insufficient capacity of the latter. The preparatory work on Yerevan TV tower and Tbilisi Tower, which also needed replacement, started simultaneously at the Ukrainian Institute for Steel Structures. The project leaders were Isaak Zatulovsky, Anatoli Perelmuter, Mark Grinberg, Yuri Shevernitsky, and Boris But. Tbilisi and Yerevan were the first among the Soviet capitals where towers were built. The same group later worked on the project of Kyiv TV Tower though it was finished earlier than in Yerevan). Tbilisi Tower is lower, lighter and slightly tilted compared to Yerevan Tower. Construction started in 1974 and finished 3 years later. The steel was shipped from Rustavi Metallurgical Plant in Georgia. The old tower was moved to Leninakan, current Gyumri, where it is still functional today. Structure The structure of the TV tower in Yerevan is virtually divided into three parts: base, body, and antenna. The base is a truss-steel tetrahedron that at the height of 71 metres becomes a closed-platform observation deck and technical offices. On the roof of this lower-tower basket are radio antennas. The triangular truss-steel structure continues to the height of 137 metres where a two-storey 18-metre structure in the shape of an inverted-truncated cone is situated. The lattice grid structure continues another 30 meters. In the centre of this structure there is a concrete vertical pipe structure with a diameter of 4.2 metres, in which, among other things, the lift-shaft is hidden. The pipe projecting from the basement continues as an antenna carrier. This form was widespread in the Soviet Union with steel towers. For example, the Kyiv TV Tower and the Saint Petersburg TV Tower follow this construction principle. The antenna carrier tapers (diameter per section: 4 meters, 3 meters, 2.6 meters, 1.72 meters and 0.75 meters) between five maintenance bridges to the top. The entire steel structure is painted white and international orange to comply with air safety regulations (similar to the Tokyo Tower and the Tbilisi TV Tower). The weight of the structure is