I was checking ebay and found this one:
http://www.ebay.com/itm/Ancient-Ruin-Os ... Swo4pYIfs2

Does anyone know where they come from?

I checked the Frostgrave range from Warlord Games but couldn't find it in there.

I'm not sure, but it looks like it's mostly just self-made.
There might be some Hirst Arts cast pieces (arches and balustrade), but other than that it's probably different types of foam and cardboard.
I also looked at his Facebook, and he seems to make lots of these terrain pieces. Beautiful as they are, I think they are mostly self-made!

Ah, that's too bad. They look excellent so I was hoping they were from a specific store.

It appears that the seller has made a mold of this and is selling resin castings. The arches on the bottom are from the "Weathertop" Hirst arts mold and the Grecian pillars might be too, or the seller is just good with cake decorations and a saw. I think the balustrade is from the hardware store.

Nice find. I took copies and am hoping to make a knock-off, all plaster of course.

Edit: the balustrade is made out of office tacks.

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"Diplomacy is the art of saying 'nice doggie' until you can find a rock." -Will Rogers

Yep, some parts are definitely Hirst Arts. Greatkhan - did the same thing, kept the picture for future reference.

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"Even darkness must pass. A new day will come. And when the sun shines it will shine out the clearer."