Editing Wieliczka (section)

===20th to 21st century===
[[File:Konopków.jpg|thumb|A branch of the [[Institute of National Remembrance]] at the Konopków Palace]]
Only by the end of the 19th century, the Galician authorities began investing in public housing. However, the city expanded with private investments, wealthy entrepreneurs built mining colonies (organized settlements for families of mine workers) and power plants (supplied electricity not only to the mine, but also to the town).

In the inter-war period, Wieliczka's total population increased which encouraged territorial expansion; local villages were incorporated into town borders and new residential districts were erected in the 1920s to meet the demands of the growing population. However, the town also witnessed the 1933 miners' strike, which took place due to the reduction of wages by 13%.

During the first days of [[World War II]], on 7 September 1939, the German Wehrmacht entered Wieliczka. They immediately began to persecute the Jewish population of around 1500, robbing and plundering. During the next two and a half years, they also brought to Wieliczka hundreds of Jews from other towns in the area, including from the [[Kraków Ghetto]] after the opening of a ghetto in the Klasno district. In total, as many as 11,000 Jews lived in the ghetto by the time of deportation in 1942.<ref>{{Cite book|last=Kazimierz|first=Pająk|title=Wieliczka – an old mining town .|publisher=Literary Publishing House|year=1968|location=Krakow|pages=127}}</ref> The town, especially the places Jews lived, became severely overcrowded and the population impoverished. In August 1942, all the Jewish population was rounded up. About 700 were taken to a nearby forest where they were shot. Others were killed in the town. Some 700 young men were taken to Pustkow and other forced labor camps. The rest were forced onto trains and sent to the killing camp at Belzec where they were murdered by gas on arrival. Very few Wieliczka Jews survived until liberation.<ref>{{cite book |last1=Megargee |first1=Geoffrey |title=Encyclopedia of Camps and Ghettos |date=2012 |publisher=University of Indiana Press |location=Bloomington, Indiana |isbn=978-0-253-35599-7 |page=Volume II pp. 590–591}}</ref>

On 21 January 1945, the [[Red Army|Soviet Red Army]] liberated Wieliczka from the Nazis. During the fighting, 138 Soviet soldiers were killed.<ref>{{Cite book|last=Council for the Protection of Monuments of Struggle and Martyrdom|title=Guide of Fighting and Martyrdom war years 1939–1945|publisher=Sport and Tourism|year=1988|isbn=83-217-2709-3|pages=372, 173}}</ref>

In 1994, the city was listed in the [[List of Historic Monuments (Poland)|Register of Historic Monuments of Poland]].