They are a remarkably resilient and obscenely stubborn people.
No better example than the Royal Castle in Warsaw. Mostly destroyed by shelling in WWII, Hitler gave the order to reduce it to a pile of rubble. The Nazis bored holes to place explosives and did just that.
But the clergy and locals saved remnants from the rubble, and the castle was eventually rebuilt starting in the 70s, using photographs, paintings...and remnants to rebuild them. If you go into a room and follow the gilded crown moulding, you'll often find one small section which is heavily tarnished. It's an original part which was used to recreate the rest. Some stubborn Pole dug through the rubble and held on to it in their basement through generations and decades knowing that someday they'd rebuild. Frankly, most of the old town in Warsaw was rebuilt that way, using period oil paintings as reference.
The Royal Castle in Warsaw
A major draw in Wroclaw, the Panorma Raclawice is a massive, 360 degree piece of art commemorating the heroic, though failed, battle for independence in 1794 against the Russians.
Yeah, that part of the world has long, long memories for history for sure.