World War II in Poland

This bombed church was given a new life as a contemporary art gallery.

This abandoned but well-preserved Prussian fortress sits abandoned in a Polish forest near the German border.

An underground city beneath Krakow's postwar socialist utopia.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

The center of this Polish border town was so thoroughly wiped out in World War II that only the foundations remain.

This lakeside bunker complex in Mamerki, Poland, housed the Supreme Military Command of Nazi Germany during World War II.

An extensive network of secret tunnels was created for the Nazi project "Riese."

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.