The Bartolomeu Dias museum complex was officially opened on 3 February 1989, however the Mossel Bay museum industry can be traced back to the 1960's when the Mossel Bay museum was first opened. The museum later became known as the Post Tree museum complex before being renamed again in 1989

Archives the town's history, timber history and the Anglo-Boer War.

The Museum (old school house built in 1902) represents the history of the village after the arrival of the Searle family in the late 1850's, the usage of water power through the past century and the local history of the Khoisan. The Information Centre is housed in the Museum