Although there's still a long way to go, it's open to the public. The gardens contain many specimen trees, and a virtually unique yew tree tunnel. Lots of links and articles about Wales. available in other languages, too. If it grows, they'll probably sell the seed for it. Vast database of species, and you can order on-line.
Visitors are welcome and there's an excellent resturant and accomodation.
The Brecon Beacons National Park is home to some of Britain's rarests and most beautiful birds, such as the red kite. Find out more on this well illustrated site. Contains graphic images of such Devil's Works as the Citroen 2CV and the Austin Allegro.