Rønnebæksholm estate is mentioned in 1321. It was owned by the crown from 1399 until 1571 while later owners include members of the Collet family who owned it from 1761 to 1777 and again from 1869 to 1994. The current three-winged building was built in 1734 and later altered in 1840-41 and again 1889-90.
Næstved Municipality acquired some of the land and associated farm buildings in 1994. In 1998, they acquired the main building and the rest of the estate. Today Rønnebæksholm Arts and Culture Centre is a self-owning institution and it hosts art exhibitions. The emphasis is on modern and contemporary visual arts.
The park is most notable for the Grundtvig Pavilion which was built for Grundtvig shortly after he married the Marie Toft, the widow at Rønnebæksholm. Grundtvig gave it the name Benligheden ('The Kindness'). It was designed by Johan Daniel Herholdt, shortly before he went abroad on a longer journey. Its design shows influence from English Renaissance garden houses, a rare inspiration in Danish architecture of the time.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.