Looking at old photographs is like traveling back in time. The viewer catches a glimpse of the world as it existed in the 50s, 60s or 70s, which gives them nostalgia for people and places that they'd almost forgotten about. They can't stay in the past, but photographs will always bring back their memories.
McDonald's (1981)

Before the sleek McCafe makeover, McDonald's used toys and playgrounds to market the restaurant to children. Every kid begged their parents to take them to McDonald's at least once--and while they were there, they could play on the giant burger with the rest of the kids. Looking back, it might've been a safety hazard.