All these flat areas covered in rubble hills used to be housing estates (usually 5-6 stories high) in the Warsaw Ghetto. It was blown up, bulldozed, razed to the ground. As you may see, other parts of the city survived in a slightly better state.

Born and raised in Warsaw I sometimes feel I'm literally walking on history. There are hundreds of commemorative plaques/stones everywhere you go in the downtown and neighbouring districts.