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.
Kallerup Stone inscription, the name "Hornbora" translates as "horn-bearer." Kallerup Stone The Kallerup Stone, designated as runic inscription DR 250 in the Rundata system, is a memorial runestone which is located in Hedehusene, Høje-Taastrup Municipality, on the island of Zealand in eastern Denmark. It is among the oldest runestones in Denmark. The Kallerup Stone was discovered in 1827 by a stonemason in a field with several stone circles near a church in Hedehusene. It was then restored in 1851 by raising it near its original position. This granite runestone, which is 1.6 meters in height, is among the oldest in Denmark and