Marietta Diner is the most striking restaurant in Marietta, Georgia. Literally. You can see its neon sign from miles away! It has one of the largest parking I have ever seen at a restaurant, and it's always, always, always crowded. If you go, you'll probably have to wait between 5 and 30 minutes, but the turnover is fairly quick.
The restaurant has many good points. First, the location: on Cobb Parkway, near the exit onto Highway 285. Also, the original 50's-style architecture with the Cadillacs parked out front. Finally, and most importantly: THE FOOD. You have to go hungry or at least willing to share because the portions are huge. The serve a typical diner menu with hamburgers, pastas, sandwiches and salads, but as the owners are Greeks, they also have several pages of Mediterranean food, even things like paella. I personally recommend the Meatball Sub, the Philly Cheestake (meat, cheese and green peppers) and gyros and souvlakis which are finger-licking good. Oh and the "Frank Sinatra" pasta! Wow! I need to stop writing, I'm getting hungry!
The desserts are pretty intense too. The cakes have up to eight layers. One portion is enough to split between two or three people. If you get Joel as a waiter (and I hope you do, he's the best waiter in the state of Georgia), send him my warmest regards.
Let me just make it clear that Homer Simpson and all the doughnut-dunking cops from the movies are absolutely justified in scarfing down donuts, especially if they come from Krispy Kreme. As far as I know, Krispy Kreme operates 24 hours a day so you can satisfy your craving for donuts at any time day or night. But, the important thing is to know WHEN to go to get the freshest donuts. You'll seem them coming out of the oven, rolling down the conveyor belt, and on to the tray. If you lucky, they then can go directly into your stomach! I'm not exaggerating when I say a freshly-baked Krispy Kreme doughnut literally melts i your mouth. Go try one, you'll thank me later.