Monastery of San Pedro de las Dueñas was built in the late 10th century and beginning of the 11th century. It is one of the most representative churches of Mudejar Romanesque in its Pre-classical period, began in stone and finished in brick (1087 and 1110) and Basilical ground plan.
Over the presbytery of the chancel stands a brick tower, it is square with progressively decreasing sections.There is an interesting collection of capitals. The most remarkable of them is the one known as 'de las siete monjas' (the seven nuns capital) and the chancel shows an interesting Christ by Gregorio Fernández.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.