Genoa Cathedral is dedicated to Saint Lawrence (San Lorenzo), and is the seat of the Archbishop of Genoa. The cathedral was consecrated by Pope Gelasius II in 1118 and was built between the twelfth century and the fourteenth century as fundamentally a medieval building, with some later additions.
Various altars and chapels have been erected between the 14th and 15th centuries. The small loggia on the north-eastern tower of the façade was built in 1455; the opposite one, in Mannerist style, is from 1522. In 1550 the Perugian architect Galeazzo Alessi was commissioned by the city magistrates to plan the reconstruction of the entire building; however, he executed only the covering of the nave and aisles, the pavement, the dome and the apse.
The construction of the cathedral finished in the 17th century. The dome and the medieval parts were restored in 1894-1900.
The Museum of the Treasury lies under the cathedral and holds a collection of jewellery and silverware from 9 AD up to the present. Among the most important pieces are the sacred bowl brought by Guglielmo Embriaco after the conquest of Caesarea and supposed to be the chalice used by Christ during the Last Supper.
References:The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.