Read the passage. Source note: Original practice excerpt about urban alleys. The urban historian's tour avoided famous avenues and turned instead into narrow alleys behind shops. There she pointed out old delivery hooks, apartment staircases, and faded signs for businesses that never had storefronts. These details showed how much of the city's work happened out of view. The passage argues that overlooked spaces can reveal economic histories missing from official landmarks. Which idea from the passage best supports the author's central claim?