The Military History Museum is the most recent addition to the Graaff-Reinet Museum Complex and was established in 2005. The building was built along the lines of a stable situated on the same premises, to ensure that it is in keeping with the architectural style of the rest of the buildings of the museum complex. The museum provides an overview of the military history of Graaff-Reinet from the 1800s until 30 June 2007.

The large erf at the southern extremity of Market Square, on which Urquhart House stands today, was granted in freehold to Johan Hendrik Greyling on 1 January 1806, which places it amongst the earliest plots transferred into private ownership in Graaff-Reinet.

This building served the town as its library until 1981 when a modern library was built in Parsonage Street. The municipality donated the old building to the Graaff-Reinet Museum which now uses it to house specialized collections. It was proclaimed a National Monument on 27 February 1987.

Reinet House, a fine example of a Cape H-plan house, was built in 1812 and may have been designed by Louis M. Thibault who designed the Drostdy at Graaff-Reinet. Much of the building material was acquired locally.

The former Residency, situated diagonally opposite Reinet House at the end of Parsonage Street, and forming a unique architectural complex with it, is a well-preserved example of the early 19th Century Cape Dutch H-shaped house.