Lynn Museum will be extending its opening hours during the summer season to help boost visitor numbers to the town centre.
The Market Street museum has received extra funding from West Norfolk Council to open up its doors on a Sunday.
Currently the collections are closed on Tuesdays and Sundays.
But between April and October, the museum will be opening from noon to 4pm on a Sunday and will be running a number of events for families.
Curator Oliver Bone said: “This is something we are working in partnership with the council and the aim is to provide people in the town with places to visit on a Sunday.
“The Stories of Lynn exhibition in the town hall will be open on a Sunday and we are hoping to be part of that offer.
“People can enjoy the town’s historic buildings, shops, restaurants and also the cultural offering through the museums.”
During the Sunday opening, museum staff will be running events to tie in with the Queen’s birthday celebrations in June along with a 1940s day.
Mr Bone said: “The museum has not really operated on a Sunday for a long time. I think Sunday have perhaps changed in recent years and it will be interesting to see how popular this is.”
News of the increased opening hours have been welcomed by Lynn Town Centre Partnership.
Chairman Darren Taylor said: “The partnership is very keen that we push the heritage and tourism offering as hard as we possibly can and investment in this is welcome.
“The museum is a fantastic resource for the town. It’s an undervalued gem.”