The basement of a castle greenhouse, so called catacombs, and a terrace with air shafts above them are located to the east by the Palm greenhouse of a state castle Lednice and they are connected with it. Catacombs used to serve as depositaries for storing plants from castle park in a period of winter month. Preservation of greenhouse’s catacombs began in 2004 and was carried out in phases till the end of 2007 when the work was interrupted. In 2012 the investor decided to proceed to finish the second part of a planned reconstruction connected with a reconstruction of basements under the greenhouse terrace. The vital part under the project documentation is also dealing with a rehabilitation of damp masonry including necessary constructional and technical research with respect to dampness and its elimination.