Getting High Climbing may be the most sober way to enjoy the thrills of emerging adulthood. The impulse to do so is universal, illustrated with two examples here: an artificial rock-climbing wall in Somerville, Massachusetts and an Art of Motion festival in Santorini, Greece.

ESSDRAS M SUAREZ/THE BOSTON GLOBE VIA GETTY IMAGES
PREDRAG VUCKOVIC/RED BULL VIA GETTY IMAGES