Hartenberg castle was probably built in the early 13th century by the lords of Hartenberg. The first information is from the year 1214. The Hartenberg family owned the castle until 1362, when Tema of Koldice obtained it from them and traded it in 1364 with Charles IV for Budysin. At the beginning of 15th century the Hartenberg family received the castle again but soon sold it to Jan Malerik. His descendants used the castle as the center of robbery attacks and that was why in 1459 the castle was besieged by the military of the town Cheb, conquered and plundered. Later Šliks owned the castle, the town of Loket and Písnic family who held it more than 150 years. In the second half of the 18th century, the Auersperk family inherited the castle. From the 17th to the 19th century, modifications occurred to the chateau. The last owner of Hartenberg was Frantiska Kopalova who inherited it in 1913 from her mother, Mary. And she was in 1945, after Second World War, relocated to Germany.
After 1945 the castle was owned by State forests and was used as a warehouse and granary. In 1983, there were plans for its reconstruction. But it ultimately never happened. From 1984–91, the castle was several times deliberately set on fire, and turned in ruins.
The castle is now owned by Bedřich Loos, a private owner who tries to maintain and repair the castle. There was elaborated the so-called Hartenberg Workshop. Already more than a thousand volunteers from all over the world participated in the repair of the castle. This workshop is the largest volunteer program in Europe.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.