Pseudokarst caves occur in various - magmatic, metamorphic and sedimentary - rocks and represent many genetical types. They have been lately a frequent subject of registration and scientific studies. The development of these caves is closely related to processes of rocks formation or postdiagenetic reconstruction, mainly denudation (erosion, weathering). Consequently the studies of these caves often provide wider information on processes controlling geological or morphological development of the area. Thus, the scientific criteria should be more often applied in the caves evaluation and selection for legal protection. In Poland the number of protected pseudokarst caves has been increasing for the last years and now legally protected caves represent more than 25% of the caves number and more than 40% of their total length.