Colchester Castle has been awarded £3,267,400 for a major redevelopment project by the Heritage Lottery Fund (HLF).
The grant will see an accessible and fresh approach to interpreting the story of England’s oldest recorded town.
Tom Hodgson, Project Manager for the redevelopment, said: “This is fantastic news.
“We are now able to put all our planning into practice and create exciting new displays that do justice to Colchester’s nationally important heritage”.
The museum will be working with the Yorkshire-based firm, Redman Design, to tell the story of Colchester from its foundation more than 2,000 years ago to its siege in 1648.
The castle displays will also be used as a starting point and link to other heritage sites in the town, such as the Town Walls and Roman Circus.
The HLF are contributing 77% of funding towards the £4,200,000 project, which began in November 2009.
The funding will be matched by Colchester Borough Council, the EU, Renaissance museum hub funding, the Friends of Colchester Museums and Essex Heritage Trust.
Councillor Nick Barlow, Portfolio Holder Commerce and Sustainability, said: “This funding will ensure that the Castle continues as a top quality visitor attraction for tourists.
“It will also continue as a place in which local residents and schoolchildren can learn and take pride in the long history of their town”.
As well as improving the museum shop and other public facilities, a second lift will be installed to make it easier for visitors to find their way around the building.
The roof of the castle will be insulated for the first time and a new under-heating system will be installed to improve the building’s energy efficiency.
Adrian Pritchard, Chief Executive at Colchester Borough Council, said: “This is a significant phase in the Castle’s history.
“It’s a step towards presenting our past for the future, creating a visitor attraction that shows Colchester is a first class destination for local people, as well as putting it on the world platform for tourism”.