Tomb of the Unknown Soldier, Warsaw
The Tomb of the Unknown Soldier (Polish: Grób Nieznanego Żołnierza) is a monument in Warsaw, Poland, dedicated to the unknown soldiers who have given their lives for Poland. It is one of many such national tombs of unknowns that were erected after World War I, and the most important such monument in Poland.
Source: Wikipedia — Tomb of the Unknown Soldier, Warsaw (CC BY-SA 4.0)