4 National Library of Belarus
Back in 1989, a new building for the Belarusian State Library had been planned, and its design was to be decided on a national contest. The winning proposal by architects Viktor Kramarenko and Mikhail Vinogradov suggested a building in the shape of a rhombicuboctahedron (try to pronounce that three times fast), which included eight triangular and eighteen square faces placed on a supporting podium. The shape itself was to be covered with heat-reflecting mirror glass, giving it a unique appearance.
The projects was quite ambitious, and maybe a bit too much, as it took 13 years for the design to be approved. Finally, in 2002, construction began, employing 5,000 people and 200 enterprises, and lasted for four years. The official opening ceremony took place on June 16th, 2006.