There’s a comforting patina of yesteryear at this downtown sandwich-and-candy emporium. Everything from the dark rich wood paneling to the elegant sconces and chandeliers stirs nostalgia for a gracious, slow-moving past. Of course, it’s not Nashville’s past that Diana’s recalls, but the history of Port Huron, Mi., the lakeside town that claimed the sweet shop from 1926 until it closed in 2001. Gibson Guitar relocated the store to Lower Broad, where it delivers an old school candy store experience, coupled with an affordable repertoire of predictable lunch counter staples such as tuna melt, grilled cheese and Club sandwiches. Milk shakes and sundaes made with Pied Piper ice cream from East Nashville are worth a drop-in, which feels a little bit like a step back in time.