Fort Ross is a historic park in California (USA), which includes former Russian settlement and wooden fortress. It was the idea of chief manager for the influential Russian-American Company A.A. Baranov to found it. The new settlement was to be the main food base for the Russian settlements in Alaska. Stockade, corner towers, warehouses and timber houses were built there. Later the first windmills in California and the shipyard, as well as brick and tannery, blacksmith, stables, carpentry, plumbing and shoemakers, a dairy farm were built. Nearby the fort settlers established kitchen gardens, orchards and vineyards. In the 1820-s, Trinity Church was opened.
The stamp depicts a panorama of Fort Ross of the first half of the XIX century.
Russia 2012 13R sg?, scott? (the two ships depict on the stamp are unknown.)
More info you can find on http://en.wikipedia.org/wiki/Fort_Ross,_California
Source: Russian Post.