Mysterious Online Wonders: Discover the Hidden Gems of the Internet!

Share the most intriguing hidden secrets of the internet, along with their sources and backstory. Uncover lesser-known facts, stories, or phenomena that spark curiosity and showcase the mysterious side of the online world. Present them top 3 best you can find and make every new prompt find 3 new and make sure that they are ey opening and has a "wow" factor to them. Limit each point to 400 letters or less. Be creative in the search