Llancaiach Fawr Manor has been awarded a £900,000 grant, which will see the former servants' quarters in a hidden attic opened up to the public for the first time.
The Grade One listed Tudor mansion in Nelson, near Caerphilly, is restored and furnished as it would have been in the seventeeth century, as Hannah Thomas reports.
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Rhondda Cynon Taf Council says millions of pounds will be spend dealing with the the slip which will involve major engineering work.
Residents said they were concerned after a section of wall collapsed into the River Tawe from rising floodwaters following Storm Dennis.
Community groups and charities like toogoodtowaste have been helping people displaced by flooding.