Limestone high quality quarried limestone, called Indiana limestone. Many famous buildings in London are built from Portland limestone. Limestone was also a very popular building block in the Middle Ages in the areas where it occurred, since it is hard, durable, and commonly occurs in easily accessible surface exposures. Many medieval churches and castles in Europe are made of limestone. Beer stone was a popular kind of limestone for medieval buildings in southern England. Limestone and (to a lesser extent) marble are reactive to acid solutions, making acid rain a significant problem to the preservation of artifacts made from this stone.
Trullo (from the Greek word "τρούλος", cupola) refers to a house whose internal space is covered by a dry stone corbelled or keystone vault. "Trullo" is an italianized form of the dialectal term, "truddu", used in a specific area of the Salentine peninsula (i.e. Lizzaio, Maruggio and Avetrana, in other words, outside the "Murgia dei Trulli" proper) where it is the name of the local agricultural dry stone hut. "Trullo" has replaced the local term "casedda" (pl. "casedde") (Italian "casella", pl. "caselle") which was used by locals in the Murgia to call this type of house. A stonemason specializing in the