Question: Albert Frederick Toll was the founder of a group that operates a network of how many sites?
Sentence (from "Hitler Sites"): Among the many sites are the middle-class homes and apartments where he grew up in rural Austria and Linz; the tenements and shelters he inhabited before ending up homeless, lice-infested, freezing and penniless in the streets of Vienna; the expansive Munich apartment where he lived as a rising politician and as Führer; and his country home, the Berghof, in Berchtesgaden.
Relevant evidence: No