The monumental walls are headed with pieces of masonry copied from Renaissance houses and palaces of Kraków and Zamość. Shortly after opening, the building hosted the 5th World Festival of Youth and Students. Many visiting dignitaries toured the Palace, and it also hosted performances by notable international artists, such as a 1967 concert by The Rolling Stones, the first by a major western rock group behind the Iron Curtain. In 1985, it hosted the historic Leonard Cohen concert, surrounded by many political expectations, which were avoided by Cohen in his prolonged introductions during the three-hour show. Four clock faces were added to the top of the building ahead of the millennium celebrations in 2000. The clocks began working on 31 December 2000. Present day The building currently serves as an exhibition centre and office complex. The Palace contains a multiplex cinema with eight screens (Kinoteka), four theatres (Studio, Dramatyczny, Lalka and 6. piętro), two museums (Museum of Evolution and Museum of Technology), offices, bookshops, a large swimming pool, an auditorium hall for 3,000 people called Congress Hall, and an accredited university, Collegium Civitas, on the 11th and 12th floors of the building. The terrace on the 30th floor, at , is a well-known tourist attraction with a panoramic view of the city. The Congress Hall held the finals of Miss World 2006. In 2010, the illumination of the building was modernized and high-power LED lights were installed, allowing the Palace to take various colours at night. The first use of the new lighting was during Christmas in 2010, when the Palace was illuminated in green and white to resemble a Christmas tree. In December 2013, during the Euromaidan protests, it was illuminated in blue and yellow, the colours of the Ukrainian national flag as a sign of solidarity with the protesters. On 29 January 2021, during the Women's Strike protests, the symbol of the movement – a single red bolt on a black background – was projected on the building. Controversy The Palace of Culture and Science is highly controversial. It is often viewed as a reminder of Soviet influence over the Polish People's Republic, especially due to its construction during mass violations of human rights under Joseph Stalin. Porozumienie Organizacji Kombatanckich i Niepodległościowych w Krakowie, a coalition of veteran and nationalist groups, as well as Law and Justice (PiS) have called for its demolition. In 2009, then Foreign Minister