A stream of men dressed as traditional Korean guards marched past a Dunkin' Donuts store in Seoul.

A tour through the streets of the South Korean capital shows how the coffee craze has sweeped Asia.

Both Dunkin' Donuts and its competitor Starbucks consider South Korea a warm-up for an even bigger play: China. Pictured: A street in Seoul.

South Korea is now home to more than 900 Dunkin' Donuts, nearly as many as there are in Massachusetts.

In addition to glazed donuts, local black rice donuts, jalepeno sausage pie donuts, and glutinous rice sticks are available.

"Since 2010 the coffee boom of shops has just exploded even more beyond our wildest dreams," said Sara Larcombe, senior director of international marketing.

In contrast to the small, squat stores often found in Massachusetts, some Dunkin' locations in South Korea rise as tall as four stories, designed as places to linger.