Glacis, also known as esplanade, is a huge engineering work in which the foreground of a fortress was shaped in such a way
that it did not contain any places where the charging enemy could hide. To determine the slopes, twists and ranges of these areas would be a difficult geometric task even today; in the past such tasks were successfully dealt with without computers. Shaping this huge earth sculpture in the ground was even more difficult. It would be impossible for reconstruct it fully today as part of the glacis is covered with buildings. Its appearance is partly reflected by the open space of common land called ”Zamojskie Pola Marsowe” and a green embankment whereas a layout of paths reflects twists of plains.