The world is full of mysteries, and sometimes, we just don’t have the answers. But the Internet does. There’s even a subreddit called What Is This Thing?, where people post photos of things they can’t identify, and others help with the answers. It’s a place where asking questions without fear of ridicule is encouraged.

Bored Panda compiled a list of some of the most random and fascinating finds from this subreddit. From an unusual public bathroom door design to a mysterious hole in the sky, these images and their explanations are sure to surprise and educate.

Scroll down to enjoy the eye-opening photos and upvote your favorites