A fictitious series often familiarizes its readers with imagined places: where the central character lives, works etc. In Poul Anderson's Time Patrol series:
Manse Everard's New York apartment appears in the first three stories and reappears several times later, from 1955 to 1990;
the Patrol Academy and Pleistocene Lodge are introduced in Time Patrol and both reappear at appropriate moments in The Shield Of Time;
the Academy is also the venue for "A worried conference..." (p. 220) in "Delenda Est";
Everard visits Dalhousie & Roberts Importers, the Patrol's London office 1890-1910, twice in the series;
We understand that the Patrol is vast and would like to be shown more of its bases and facilities throughout history and prehistory.