They're those corners of the world that you just can't get out of your mind. Places so special, or just plain weird, that they take on their own personalities. National Geographic scoured the United States to include just such places in its ZipUSA series.
This month visit Portland, Oregon, where the country's largest, wildest urban forest flourishes.
Other zips in the works range from Barre, Vermont, where granite gravestones and cemeteries keep the town alive, to Fargo, North Dakota, where winters give new meaning to cold, and the only thing warmer than the food at the annual Pancake Karnival is the spirit of the people.