Question:  Peter Kalifornsky was the great grand son of Qadanalchen who worked in a the hub of the southernmost Russian settlements in North America from 1812 to 1842 that has been the subject of what?
Sentence (from "Fort Ross, California"): It has been the subject of archaeological investigation and is a California Historical Landmark, a National Historic Landmark, and on the National Register of Historic Places.
Relevant evidence: Yes