One of the most sobering experiences you can have is to tour one of the many Nazi concentration and extermination camps located in Central and Eastern Europe.  This picture shows the electrified barbed-wire fence and guard towers that surround the infamous death camp Birkenau, located just outside the city of Krakow, Poland.  More than a million people lost their lives at this one location. To learn more about Birkenau and take a virtual tour of the camp, go to http://remember.org/camps/birkenau/bir-introduction.html