Lifeboat Foundation

For more than 5,000 years, humans have adorned themselves with tattoos.

In a new study, researchers used lasers to uncover highly intricate designs of ancient tattoos on mummies from Peru.

The preserved skin of the mummies and the black tattoo ink used show a stark contrast—revealing fine details in tattoos dating to around 1,250 A.D. that aren’t visible to the naked eye, said study co-author Michael Pittman, an archaeologist at the Chinese University of Hong Kong.