ContentsIntroduction The Museum Necropolis of St. Petersburg. A historical review 1. The stone materials of the monuments 1.1. Marble 1.2. Limestone 1.3. Granite and other hard rocks 2. The environmental conditions 2.1. The air environment 2.2. The condition of soils 2.3. Vegetation 3. The peculiarities of the destruction 3.1. The major destruction of stone 3.2. The biological damage of the stone 3.3. The formation of gypsum enriched patina on marble and limestone 3.4. Patina formation on bronze 4. Evaluation of monuments state and restoration effects 4.1. A.I. Kosikovskiy monument 4.1.1. The results of the evaluation of state before restoration 4.1.2. The restoration works 4.1.3. The evaluation of state after restoration 4.2. E.A. and V.N. Kochubej monument 4.2.1. The restoration works 4.2.2. The evaluation of state 4.3. A.Ja. Okhotnikov monument 4.3.1. The restoration works 4.3.2. The evaluation of state 4.4. M.V. Lomonosov monument 4.4.1. The restoration works 4.4.2. The evaluation of state 4.5. V.V. Stasov monument 4.5.1. The evaluation of the bronze figure state 4.5.2. The evaluation of granite boulder state5. Approaches and methods for monitoring and monument protection 5.1. The main stages of evaluation 5.2. Visual inspection of the monuments. The sampling 5.3. Qualimetric evaluation of state 5.4. Mapping of the material destruction forms 5.5. Application of laser scanning 5.6. Laboratory instrumental methods 5.7. The creation and filling of database6. The experience of the monument protection from biological damage Conclusion ReferencesINDEXCONTRIBUTORS