In 1978 UNESCO placed the Main Square as part of the Old Town Kraków on the list of World Heritage Sites. On 21 March 1980, in a time of political tension and the run-up to the declaration of Martial Law in Poland, Walenty Badylak, a retired baker and a veteran of Poland's wartime underground Home Army, set himself alight chained to a well in the Main Square. Badylak was protesting the communist government's refusal to acknowledge the Katyn war crime. Also, the Main Square was central in staging mass demonstrations of the Solidarity movement. In 2013 Lonely Planet travel guides rated Kraków's Main Market Square as the most beautiful in the world.