Wellingsbüttel Manor is baroque manor house in Hamburg, which once enjoyed imperial immediacy (Reichsfreiheit). Wellingsbüttel was documented for the first time in 1296. In the early 19th century it was the residence and place of death of Friedrich Karl Ludwig, Duke of Schleswig-Holstein-Sonderburg-Beck, the penultimate duke, who was an ancestor of the present-day British royal family.
Wellingsbüttel Manor was elevated to the status of a Danish 'chancellery manor' (Kanzleigut). It was then acquired by Grand Burgher of the Free and Hanseatic City of Hamburg Johann Christian Jauch junior (1802–1880), becoming a country estate of the Jauch family. The manor house is together with Jenisch House one of Hamburg's best conserved examples of the Hanseatic lifestyle in the 19th century and jointly with the manor gatehouse a listed historical monument.
Theobald Joseph von Kurtzrock erected the present manor house in 1750. In 1757 Georg Greggenhofer designed the gatehouse.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.