The Palace of Culture and Science was built between 1952 and 1955; it was a "gift of the Soviet people to the Polish nation", offered by Joseph Stalin himself. The architect was Lew Rudniew. The Palace is the highest building in Poland, standing at 237 m (which is 42 floors) with an area of 817,000 m2 and has over 3,000 rooms, including offices, institution headquarters, two private universities and the Polish Academy of Sciences. Moreover, the Palace has a post office, cinema, swimming pool, museums, libraries and theaters. The palace is one of the largest conference facilities in Warsaw, comfortably accommodating more than 4,500 participants at a time, at dozens of meetings and training conferences annually. The big attraction for tourists and residents is the 'trzydziestka', a large terrace on the 30th floor of the Palace (at a height of 114 m), where you can admire the gorgeous panorama of Warsaw. On New Year’s Eve, 2000, the Palace of Culture and Science unveiled the second-largest clock in Europe: its four discs are each 6 m in diameter, and it is highest clock tower in the world.The latest attraction offered in the Palace is virtual reality application “History Horizon”, which allows to see how Warsaw looked in XI, XIV, and XVI century, and in 1944 – destroyed after the Warsaw Uprising.