It's been kept perfectly inside a piece of amber.
Scientists have said that it is more than 120 million years old. That's as old as the dinosaurs!
The web has lasted this long because it's been inside the amber.
Amber is a kind of glue produced by trees that goes hard over millions of years.
Preserved
Many insects and spiders can be kept in amber like this and found millions of years later.
In the Jurassic Park films, the scientists got hold of dinosaur DNA by taking it out of pieces of amber, which dated back to the dinosaur period.
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