Enter the main entrance of the Palace of Culture and Science (the side at ul. Marszałkowska), take a left and you reach the Gallery of Steel Figures. Think of Madame Tussauds in London, and this is similar - just that the figures and models are all made from recycled metals! There are cars here, animals, various cartoon and movie characters (Minions, Transformers and the Hulk!) to explore. If you need more detail, the models are made from, well, old nuts, bolts, bits and pieces of metals, basically anything found in a scrapyard! Not cheap to enter, but it is visually fascinating!