The Wendy's on Two Notch Road in Dentsville, near the K-Mart and Hess station was the first one in Columbia (at least that's the way I remember it). When Wendy's opened, it had an appealing retro decor: The tables were covered with 1890s newspaper ads, and the walkway was hung with plastic hippie beads and baubles. More importantly, they could make a good burger, the way you wanted it and fast. You placed your order at the register, and by the time you had paid and walked to the end of the counter, your burger was out, hot and customized. This was in marked contrast to McDonalds, Burger King (no matter what their commercials said) and Hardee's. Even aside from getting it quickly, the Wendy's "Single" was larger than a McDonald's burger, and seemed to taste better. Having found a winning formula, they naturally decided to tinker with it. They branched out into other food items like chicken and baked potatoes, added salad bars, and most importantly, slowed down the service. At some point in the 80s, going to Wendy's had become as bad for slow, incompetent service and incorrectly prepared orders as any other burger chain. It's still a cut above McDonalds and Burger King (the jury is still out on Hardee's until I get a chance to try their new Thickburgers..), but nothing special.
I don't know if the Two Notch location was a voluntary closing as part of the general flight from Dentsville (Olive Garden, Kroger, Lizard's Thicket, Target...) or if they just couldn't make it any more.
UPDATE 18 Feb 2011 -- This place is now (and has been for some time) Nick's Gyros & Subs: