Works by Wercollier can be found in public places and museums in Belgium, France, Germany, Israel, Luxembourg, Switzerland and the United States.

During the German occupation of Luxembourg in World War II, Wercollier refused to join the Reichskulturkammer, the Nazi organization that ensured all artists' works were of an acceptably "Aryan" spirit.

In 1965 when the lighthouse-shaped National Monument to the Strike was opened in Wiltz (which won the title of the "martyred city" for the Germans' particularly strong vehemence leveled against it in response), Wercollier created the two reliefs on the lighthouse displayed there.

Another well-known work is his marble monument La Vague ("The Wave"), located on the grounds of the Neuro-Psychiatric Hospital (Centre hospitalier neuro-psychiatrique) in Ettelbruck, Luxembourg.

For example, his bronze The Political Prisoner stands at the National Monument to the Resistance and to the Deportation at the Notre-Dame Cemetery in Limpertsberg, Luxembourg City.