Since the style of the Renaissance was generally regarded as the most revered in old Polish architecture, it was also used for augmenting Poland's Socialist national format. However, in the course of incorporating the principles of Socialist realism, there were quite a few deviations introduced by the communists. One of these was to more closely reflect Soviet architecture, which resulted in the majority of works blending into one another. From 1953, critical opinions in the Party were increasingly frequent, and the doctrine was given up in 1956 marking the end of Stalinism. The soc-realist centre of Nowa Huta is considered to be a meritorious monument of the times. This period in postwar architecture was followed by the mass-construction of large Panel System apartment blocks, most of which were built outside the city centre and thus do not encroach upon the beauty of the old or new towns. Some examples of the new style (e.g., Hotel Cracovia) recently listed as heritage monuments were built during the latter half of the 20th century in Kraków.