Hugo is correct,
It is Plas Cadnant Hidden Garden near Menai Bridge called so because it was derelict in 1996 when the present owner bought it.
Then on Boxing Day 2015 much of their hard work was destroyed by floods.
There are amazing before and after the flood photos in the entrance area.
It really is a beautiful garden and well worth a visit. They also have holiday cottages with one of them in this situation in the garden itself (first photo).
As for the quiz photo, yes I did take it but here is an honest account of how it came to be like that!
I tripped on some steps and thankfully saved the wonder camera as I had the wrist strap on (lesson learned there from DaveR's experience a few years ago) but unbeknown to me until I downloaded my pics, the setting had got moved from my normal auto to "S" and all the ones I took after the fall were bleached out. I was so disappointed that I started playing with some effects and arrived at that one.