The new museum replaces the previous one which was closed in 2007, and it provides a detailed insight into life in Wandsworth from the Stone Age to the modern day.
Along with an impressive collection of objects, there is also a timeline of events telling the story of the cultural and natural landscape of the borough.
Among the exhibits on show is a woolly rhinoceros skull dated to 25,000BC, a telephone exchange, and a diagram of the local Young’s brewery site.
Mr. Johnson told Visit London:
“I think it’s fantastically important to have museums such as this because we live in an age where people are both forgetful of their history but also incredibly excited when they discover about it.
“It’s frightfully important that local kids are able to come here and open a window into the lives of previous generations and inhabitants of Wandsworth.
“This was a very important place in the life of London and the life of the nation as a whole and we’ve now got great exhibits here to tell that story.”
The new Wandsworth Museum opens to the public on 3 Sep (website coming soon).
What’s your favourite local museum in London?