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Dominic Rudakevych and Marilyn Fisher, 2014 champions of the National Marbles Championships in Wildwood, N.J., pose at the marbles rings in Middletown, Md. The two 13-year-olds train with the Frederick County Knucklers, a competitive marbles recreational program in Maryland. NPR/Sarah Tilotta hide caption

itoggle caption NPR/Sarah Tilotta

A rooftop view of East Baltimore, 1979. Elinor Cahn/Courtesy of Elinor Cahn Photographs, The Photography Collections, University of Maryland, Baltimore County hide caption

itoggle caption Elinor Cahn/Courtesy of Elinor Cahn Photographs, The Photography Collections, University of Maryland, Baltimore County

Deion Jefferson, 10, and Samuel Jefferson, 7, take turns climbing and jumping off a stack of old tires at the Berkeley Adventure Playground in California. The playground is a half-acre park with a junkyard feel where kids are encouraged to "play wild." David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR