The TV tower on Avala hill, near Belgrade, was built in 1965. It was designed by architects Ugljesa Bogunovic and Slobodan Janjic and the project of structure was done by engineer Milan Krstic. The total height of the tower was 202.87 meters. It was the only tower in the world with the section in the form of equilateral triangle, with reinforced angles of the spherical section. The three poles of the tower were jointly leaning on the foundation block which was 1.4 meters buried into the rock. During the years, it became one of the symbols of Belgrade. The NATO planes bombed it on 29th April 1999 at 22:40 hours.