There are literally thousands of online resources that deal with the Holocaust, World War II, concentration camps, and the Third Reich. I will not attempt to list those here. Below you will find some very useful starting points to expand your understanding of the issue. I also recommend that people do online searches for individual camp names, such as "Mauthausen" for instance, to find sites on specific places. There are web sites now devoted entirely to individual camps, specific individuals related to the Holocaust, and even specific Holocaust events.

United States Holocaust Memorial Museum: The official site of the Washington, D.C.-based museum contains a wealth of data and a good online archive.

Yad Vashem: The official site of Irsrael-based Holocaust Martyrs' and Heroes' Remembrance Authority is another good online source for background and education material.

Documents of the Holocaust: Yad Vashem has published a collection of some of the most important documentary material about the Holocaust, translated into English. This site is an outstanding resource. (Click on "Documents of the Holocaust.")

Simon Wiesenthal Multimedia Learning Center: This online guide offers a comprehensive resource on the Holocaust and World War II, along with FAQs about the Holocaust -- a good starting point.

Holocaust education page: This well-designed resource, published by the Florida Center for Instructional Technology, College of Education, University of South Florida, contains an overview of the people and events of the Holocaust through photographs, documents, art, music, and literature. It's a good page for education source material.

Concentration camp overview: Frenchman Vincent Chatel's site, called "History of Nazi Concentration Camps, Work Camps, Police Camps, Transit Camps, ... ," provides background material on the camps, survivor testimonials, and much more.

Camp list: This site, maintained by Frenchman Vincent Chatel, provides a list of some of the thousands of Nazi camps built throughout Europe as well as information about some of those facilities.

Holocaust education material: A site with links to Holocaust information, maintained by About.com.

Nazi Medicine: This site, published by the U.S. Holocaust Memorial Museum, presents an overview of the war crimes trials against 23 Nazi doctors, scientists, and pseudo-scientists. It contains a good overview of some of the many crimes committed by the Nazis' medical, mental-health, and scientific communities during the war.

Bibliography on Nazi medicine: The Simon Wiesenthal Center provides this useful online resource.

"Euthanasia" killing centers: A map of the Nazis' medical "euthanasia" sites where tens of thousands of persons with genetic and birth defects, mental health illnesses, and other maladies deemed harmful to the Nazi state were murdered.

Holocaust timeline: A timeline of the Holocaust provided by the Simon Wiesenthal Center.

Persecution of the Gypsies: A reproduction of a pamphlet originally published by the United States Holocaust Memorial Museum as a pamphlet titled "Sinti & Roma," which highlights the Nazis abuses against Europe's Gypsies, which many experts classify as genocide.

The rescue of Danish Jews: The U.S. Holocaust Memorial Museum provides a brief overview of one of the few bright moments that pierced the dozen years of Nazi darkness in Europe -- the boatlift of Danish Jews to Sweden in October 1943.

Maps of the Holocaust: A great map page published by the Florida Center for Instructional Technology, College of Education, University of South Florida, showing maps highlighting the Holocaust, from the rail system that brought prisoners to Auschwitz to the Warsaw Ghetto.

Concentration Camp Maps: A map showing the camps, published by the Florida Center for Instructional Technology.

Concentration and death camps map

Map of some Nazi concentration camps