The recently published Infinity issue of Opium Magazine has a nine-word story printed on the cover that will take 1,000 years to read.
The cover is printed in a double layer of standard black ink, with an incrementally screened overlay masking the nine words. Exposed over time to ultraviolet light, the words will be appear at different rates, supposedly one per century.
But just as technology is increasing the speed of the media cycle, so too can it defeat the purpose of this experiment and allow us to read the story well before 1000 years. A UV source much stronger than the Sun should do the trick.