The name is in singular, as it houses the unidentified remains of one young soldier, but the tomb contains urns with soil from numerous battlefields where Polish soldiers have fought and died.
It serves as a symbolic grave for thousands of unnamed heroes who died for Poland throughout history.
The monument is the only surviving portion of the historic Saxon Palace, which was destroyed during World War II.
An eternal flame burns at the site, which is guarded 24 hours a day by the Representative Regiment of the Polish Army.