A century before cats dominated YouTube, they were the subject of one very adoring photographer.

Recently, a family member reached out to YouTuber Mathieu Stern with a fun fact: There was possibly a time capsule hidden in his old family home.

The photography experiment-focused video-maker looked into it, and sure enough discovered a box he estimates dates to roughly 1900, based on its contents — which included 120-year-old glass-plate negatives of cat photos.