1121 Hampton Av.

St. Louis, Mo.

What people say: This is old-school, greasy diner food — and customers, many who've been regulars for years, love it.

Where it's at: This iconic diner is located in Gateway City's historic Clayton-Tamm neighborhood. Diners who have a taste for adventure after their meal can head north to 1,300-acre Forest Park, which is home to the St. Louis Zoo as well as the city's Art Museum. 

What to order: Try a slinger, a breakfast concoction of meat (usually sausage), eggs, hash browns, chili, cheese, and onions.

The Best Hole-in-the-Wall Diner in Every State (msn.com)