When it comes to fun places to visit in South Wales, the place you cannot miss in The Valleys is the Welsh Mining Experience.
Experience 1645 in the beautifully restored Llancaiach Fawr Manor House. The fire is roaring and the table is set.
Caerphilly Castle is the largest castle in Wales and the second largest in Britain behind Windsor.
Gellihaf House is an absolutely lovely boutique bed and breakfast that also does a fantastic home-made afternoon tea on the weekends.
I imagine it must be dramatic in winter and super colourful in Autumn along these roads. There are also loads of cute houses, gates and wider views for great photos.