In the bustling Koreatown neighborhoods in New York City and Los Angeles, all-night spas cater to the sore muscles of restaurant chefs, actors and other professionals whose workdays end at 3 a.m. instead of 5 p.m. But twenty-four-hour spas can also be found in smaller towns throughout the country (primarily ones with sizable Korean communities), including Dallas and Duluth, Ga. Whether spa-goers are seeking inner peace or just exfoliation, these places deliver.