Monument Tomb of the Unknown Soldier in Warsaw

You're standing on Piłsudski Square in Warsaw, at the Tomb of the Unknown Soldier. Take a look at that row of columns in front of you. It looks like a stray fragment of a building, and that's exactly what it is. This is the only surviving piece of the Saxon Palace, which stood here until the Second World War. On either side you can still see the original damaged walls.