Photos: Lintao Zhang/Getty Images
'Happiest 5k on the Planet'
Unlike other 5k events, this untimed race emphasizes fun over competition. After kicking off the race in white clothes, runners mark each kilometer by passing through "color stations," where they are pelted with colorful, nontoxic dye made of cornstarch.
Ever since the first Color Run debuted January 2012 in Phoenix, Ariz., the family friendly event has expanded to more than 100 cities across the globe.