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Denny's Restaurant Review: Dennys opened in 1953 as Dannys Donuts. After expanding the menu to include sandwiches and entrées and opening more locations, founder Harold Butler renamed the then 20-restaurant chain Dennys. With nearly 1,600 locations around the world, this seemingly ubiquitous brand offers a laundry list of diner food for any time of day --- since its open 24 hours --- and for any member of the family, from kids to seniors. Ask about the value menu with $2, $4, $6 and $8 meals, or try the classic favorite, the All-American Slam. Other locations.