For two decades, a big boulder sat in the corner of the main office at Bileola state high school in Queensland, Australia. Now, scientists discovered that the boulder boasts more than 60 fossilized dinosaur footprints from 47 different dinosaurs.

A large boulder used as decoration in a rural Australian high school’s foyer is actually covered in dinosaur footprints —it just took around 20 years for anyone to notice. After examining the ancient rock,

A slab that's been stored at a high school in Queensland, Australia, for 20 years reveals 66 dinosaur footprints from the early Jurassic period.