Just north of downtown Portland, Ore., a neighborhood of former warehouses opens up to reveal a culinary hot spot. Once home to bustling factories and rail yards, Portland’s newly hip neighborhood, the Pearl District, gained its nickname when the area’s art galleries opened in the mid-1980s. “All these crusty warehouses, they’re sort of like oysters on the outside,” says Heidi Burnette, co-owner of local Forktown Food Tours (forktownfoodtoursportland.com).