The mining of limestone was begun in Gotland in early Middle Ages. There was a significant lime kiln in Barläst, which was used to produce quicklime through the calcination of limestone. The kiln was used between 1690-1907. Today the area is a well-preserved sample of early industrial milieu. There are ruins of three lime kilns, the oldest one dating from the 17th century.
References:The Temple of Edfu is one of the best preserved ancient shrines in Egypt. It was built in the Ptolemaic Kingdom between 237 and 57 BC.
Edfu was one of several temples built during the Ptolemaic Kingdom, including the Dendera Temple complex, Esna, the Temple of Kom Ombo, and Philae. Its size reflects the relative prosperity of the time. The present temple initially consisted of a pillared hall, two transverse halls, and a barque sanctuary surrounded by chapels. The building was started during the reign of Ptolemy III Euergetes and completed in 57 BC under Ptolemy XII Auletes. It was built on the site of an earlier, smaller temple also dedicated to Horus, although the previous structure was oriented east–west rather than north–south as in the present site.