In reply to gilchrist222:
The Doethie Valley in Mid-Wales [OS Map 187] - Best seen from SN 77491 51783, best accessed from Soar y Mynydd Chapel.
Also
Dinas Nature Reserve, near to where the Tywi and the Doethie rivers meet at SN 77847 46687. Same map as above, best accessed from the RSPB car park in Ystradffin
Also
Sgwd yr Eira waterfall, Brecon Beacons - [OS Map OL12] SN 92800 10001 best accessed from Ystradfellte Car park by the New Inn Pub SN 92939 13444
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Carreg Cennen castle - [OS Map OL12] SN 66643 19345 best seen from a south easterly position, the closer you can get to it the better, the Beacons Way goes through the castle area, if you were to walk the route from say SN 68457 18595 you should find an ideal shot
Jason