Llancaiach Fawr Manor has been awarded a £943,200 grant, which will see its hidden attic - a former servants' quarters - opened up to the public for the very first time.
The Grade I listed Tudor mansion in Nelson, near Caerphilly, is restored and furnished as it would have been in 1645. The money will be used to improve and conserve the attraction, and also provide better access for wheelchair users.
Cllr Ken James at Caerphilly County Borough Council said the Heritage Lottery funding 'would help transform the way the past is presented to a modern audience'.
More top news
Mark Jones is accused of the murder of five-week-old Amelia who he was babysitting while her mother went to watch a film.
Another windy day with some heavy showers especially in the north. Some decent spells of sunshine in many places but feeling chilly.
Plaid Cymru leader Leanne Wood launches party's election manifesto saying it wants a better funding deal for Wales and an "end austerity".