One of the most impressive cards I have ever seen, is a card I received from Sylwia. It shows the gat to the Auschwitz - Birkenau camp. It is also know as the gate of Death.
#1 Auschwitz Birkenau
The fortified walls, barbed wire, platforms, barracks, gallows, gas chambers and cremation ovens show the conditions within which the Nazi genocide took place in the former concentration and extermination camp of Auschwitz-Birkenau, the largest in the Third Reich. According to historical investigations, 1.5 million people, among them a great number of Jews, were systematically starved, tortured and murdered in this camp, the symbol of humanity's cruelty to its fellow human beings in the 20th century.
#2 Medieval Town of Torun
Torun owes its origins to the Teutonic Order, which built a castle there in the mid-13th century as a base for the conquest and evangelization of Prussia. It soon developed a commercial role as part of the Hanseatic League. In the Old and New Town, the many imposing public and private buildings from the 14th and 15th centuries (among them the house of Copernicus) are striking evidence of Torun's importance.