In 2009, Switzerland was set to close its McDonald's franchise because of the economic crash. Hjörtur Smárason, an anthropologist, was one of the very last customers to order burgers and fries from the McDonald's. Six years later, those burger and fries are still holding up pretty nicely.
Three years into saving his burger and fries, Smárason noticed that his meal had not shown any signs of going bad. There was no odor, mold, or any visible signs of decay coming from the fast food combo.
Smárason kept the combo in storage for a total of 2,190 days, or six years. Aside from looking a little dry, what's deemed "The Last McDonald’s Cheeseburger sold in Iceland" remains unchanged.
Other than a few occasional photo op trips, the burger and fries is currently on display at a hostel where folks can come and watch the meal not age.
McDonald's has since commented on the phenomenon saying that foods need certain conditions to decompose. If the burger and fries were stored in an environment without any moisture, decomposition is pretty unlikely to happen. Mold and bacteria would be unable to grow, either.
The fast food brand compared the burger and fries to dehydrated food which could last for years.
Not sure how great that beef patty is, but the burger bun and fries look pretty tasty at first glance. It's gotta be rock-hard by now, but still.