Cofitachequi: We can’t pronounce it, we don’t know exactly where it is, but the importance of this Native American mound city is clear. North Carolina has the Lost Colony, a 16th-century legend that draws the curious to the longest running outdoor theater production in North America. The desert Southwest has the Anasazi, the native culture that vanished in the 14th century and is celebrated at a dozen National Park Service sites. South Carolina has a combination of the two — Cofitachequi. Ever heard of it? Cofitachequi is mentioned in third-grade S.C. history books, and there’s a diorama about it at...