Longtime viewers of the "Law & Order" franchise know a diner is an integral part of the history: a safe haven for the detectives to grab a bite between cases or question potential witnesses of a crime.

And now, fans can visit the "Dun Dun Diner," a special pop-up celebrating 25 years of the mothership series. Don't worry, "SVU" lovers, there are nods to Olivia Benson and Elliot Stabler , as well.

The attraction, from NBC and Peacock in collaboration with NVE Experience Agency, will run from Friday, Oct. 3, to Sunday, Oct. 5, at New York City's Rockefeller Center. Reservations were free and available to the public on a first-come, first-served basis. While reservations are sold out, the retro diner set is visible to all from the outside and makes for a cool photo-op.

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