Warsaw is a large European city, composed of various architectural styles, and its Old Town is a UNESCO World Heritage Site. World War II brought massive destruction to Warsaw. Nazi Germany's retaliation for the outbreak of the Warsaw Uprising in 1944 was particularly dramatic for all of Poland. During this time, the Germans deported hundreds of thousands of Varsovians to concentration camps or forced labour, and completely destroyed the city's buildings. Today, however, Warsaw, which was once more than 80% destroyed, has been rebuilt and awaits visitors, which is why it is called the City of the Phoenix, because, like the Phoenix, it has been reborn from its ashes. Founded in Warsaw in 1747, the Załuski Library was the first public national library in Europe. The Palace of Culture and Science, Warsaw's most famous monument, was at the time of its completion the second largest building in Europe and the largest building in the capital. Among Polish skyscrapers, it had no equal before more than six decades. As of 2021, the 310-meter Varso Tower office building took over the title of tallest skyscraper. Also, worth seeing in Warsaw are the Palace of Culture and Science mentioned above, the Old Town Square with the city's emblem and symbol - the Warsaw Mermaid, Castle Square with the Column of Sigismund III Vasa, the Royal Łazienki Park, the Warsaw Uprising Museum or the Copernicus Science Centre.