Interactive map: Nazi death camps

Auschwitz, where more than 1 million Jews, Roma (Gypsies), Poles, Soviet prisoners of war and others were killed.

But as horrific as they were, they were only three camp complexes in a system of more than 850 ghettos, concentration camps, forced-labor camps and extermination camps that the Nazis established during the 12 years Adolf Hitler was in power.

Bergen-Belsen was another camp whose overlords erased as much history as they could.

Historians may never determine how many prisoners the camp held in its time, but it’s clear that about 50,000 people perished there, including Anne Frank, who died of disease mere weeks before the camp was liberated.

CNN