We have covered many websites that cover people, what about a search engine that covers internet connected devices? Do you think it's possible? For more information refer to https://www.shodan.io.
This website will help you discover many devices connected to the internet. It will help you locate where they are and even who is using them. The idea behind the website is to help you understand the digital footprint and see the big picture; websites and web services are just a part of the internet. There are also power plants, smart TVs, refrigerators, and much more.
Of course, there is also The Dark Web. This is covered in a different book published by Packt Publishing. If you are interested search for: Learn Dark Web – Fundamentals ...