The Monastery of St. Stephen was founded by St. Antoninus Cantacuzene, who is thought to be a son of the Serb ruler Nicephorus II of Epirus, in c. 1400.
This monastery rests on the plain rather than on a cliff. It was shelled by the Nazis during World War II who believed it was harboring insurgents and was abandoned. The monastery was given over to nuns in 1961 and they have reconstructed it into a flourishing nunnery, with 28 nuns in residence in 2015.
The old katholikon (main church), which was rebuilt in 1545 and frescoed shortly thereafter, still stands. The new katholikon was built in 1798 and is currently being frescoed by a modern artist. It is dedicated to the martyred St. Charalambos, whose head it contains.
The refectory (15th century) has a surviving fresco of the Virgin in the apse. The monastery contains a small museum of vestments and other religious objects and the nuns sell handmade embroideries and other trinkets.
Monasteries of Meteora are included on the UNESCO World Heritage List.
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.