Poland's President Andrzej Duda is to open a new museum Thursday that will honor hundreds of Poles killed for helping Jews during the Holocaust.

The Ulma Family Museum of Poles Saving Jews, in the village of Markowa, opens at the site in southern Poland where Germans killed an entire family for sheltering Jews in 1944. The victims included Jozef Ulma and his wife Wiktoria, who was pregnant, their six small children, and eight Jews in hiding.

It is Poland's first memorial devoted to the Christians who helped Jews during the war, an act punishable by death.

Israel's Holocaust remembrance institute, Yad Vashem, has bestowed the title of the Righteous Among the Nations on some 6,600 Poles who saved Jews during the Holocaust — more than any other nation.