Collection of historical archival photographs and materials is an obligatory part of the preparatory work of ASM Group, preceding the restoration project.

Archival photographs and drawings allow you to accurately determine the losses, and often help to clarify which buildings surrounded them.

This allows you to approach the design as accurately as possible, balanced, from the standpoint of historical reliability.

Specialists of "ASM Group" try to repeat the angles of such photos so that the comparative analysis is the most visual.

But this is not always possible, as is the case with the Meller battle tower.

The pre-revolutionary photo was taken from a fairly long distance - the tower is perfectly visible to the full height, without any prospective distortions. Today, such an angle is impossible - due to numerous landslides of the slope, the tower is now located near the cliff and photofixation is possible only from a distance of several steps from the walls.