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'.
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Cloudy with rain and strong winds, local gales along exposed coasts. Rain persistent across western hills, and becoming heavy later.
It will be cloudy with hill fog and mild overnight with increasing winds, with gales around southwestern coasts.