It was declared a National Monument under old NMC legislation on 27 December 1985. This former government building, an architectural treasure in itself, containing some impressive artifacts. Particularly noteworthy is a collection of late 18th and early 19th century Cape furniture. The Drostdy Museum was built by the Dutch East India Company in 1747 to serve as residence and official headquarters for the Landdrost. Soon after a gaol, a house for the secretary, a mill and various outbuildings were erected.

The first Landdrost to be appointed to this district was Johannes Theophilus Rhenius and he was assisted by a board of burger heemraden and subordinates like secretary and a gaoler as well as many slaves. From 1827 the Drostdy was occupied by the civil commissioner who, with the resident magistrate, replaced the board of Landdrost and heemraden when they were abolished by the British colonial government.
In 1846 the government sold the Drostdy and the property was subdivided. In 1855 the former Drostdy was bought by the Steyn family and it remained in the hands of this family until 1939 when it was bought by the government of the Union of South Africa for the purpose of establishing a museum.
The Ambagswerf:
Farming was the chief occupation in this region. Self-sufficiency was necessary to survive and the new settlers had to feed and clothe themselves and make their own furniture and household necessities. In 1969 a decision was taken to expand the Drostdy Museum complex by adding an open air section where tools and equipment used by artisans of the past could be exhibited, as well as structures and equipment relating to the wheat industry. For this purpose, buildings were erected which would be sympathetic in design to the existing eighteenth and nineteenth century structures. Ambagswerf means trade yard. The trades represented here were practiced in Swellendam in the early years of white settlement. It was here that provisions were purchased and repairs to wagons and other equipment were made.
The creation of an Ambagswerf is merely a convenient means to exhibit these trades and it is not the recreation of an historical site.
-33° 56' 45.6", 18° 46' 26.4"
27592, 9/2/084/0051