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(CNN)Visiting every Starbucks on the planet takes dedication, patience and a serious caffeine addiction.
A man who said his legal name is Winter has visited at least 15,061 Starbucks locations on four continents since 1997, he claims. And what started as a quest for espresso became his ticket to the world.
"I call it an extreme hobby," he told CNN of the quest to reach them all.
Photos: Photos of the new Starbucks Roastery in Milan