The castle of Suvero was built in the 12th century by the Malaspinadi Villafranca on a hill overlooking the village. During the 15th century it was assigned to the Campofregoso, after Genoa had conquered the territories of the Malaspina. At the behest of King Louis XII, the Genoese returned it to the original owners. After the death of Spinetta Malaspina, lord of Suvero, it became an independent fief assigned to Rinaldo Malaspina, who probably built the castle.
There were then several lords of the Malaspina family: some of them shined for their governmental talent, while others provoked dissatisfaction among the subjects. In 1600 the villagers of Suvero decided then to submit to Spain and to Tuscany, but in the end they always returned under the rule of the Malaspina. After the beginning of the Renaissance the castle lost its defensive function and became definitively a residence. For over 200 years it was the residence of the lords of Suvero and was rarely involved in battles.
The current structure, which probably stands on a pre-existing medieval building, is trapezoidal with three fortified corners and impressive fortified towers. On the western side there is a circular fortified tower. In the 19th century the eastern fortified tower collapsed, and in 1921 the southern one was destroyed by the earthquake. Both have been restored.
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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.