The Internet has different levels, 8 in total. Each one has it's different kind sites. Internet is like an iceberg: only a part of it can be seen.
LEVEL 0 - COMMON WEB
This level is the one you browse everyday: YouTube, Facebook, Wikipedia, RedTube, and other famous or easily accessible websites can be found here. Yes, RedTube. Deal with it.
LEVEL 1 - SURFACE WEB
This level is accessible through normal means and most of the Internet is here. Websites like Newgrounds can be found here.
LEVEL 2 - BERGIE WEB
This level is still accessible through normal means, but contains "darker" websites, such as 4Chan or MyDick. I do go there, but you shouldn't. Really.
LEVEL 3 AND 4 - CHARTER WEB
This is where the Dark Side begins. You must hide your IP in order to get here. These levels are divided in two parts. The first can be accessed through TOR. Things such as drug and human trafficking, banned movies and books and black markets exist there. The second part can be accessed through a hardware modification: a "Closed Shell System". Here, shit becomes serious. This part of the Charter Web contains hardcore child porn, experimental hardware information, assassins, necrophilia, gore, hackers, Hidden Wiki, but also darker information, such as, World War 2 stuff and so on. Be careful.
LEVEL 5 - MARIANAS WEB
Here darkness is similar to Level 3 and 4, just bigger. Necrophilia, even more hardcore child rape and so on. Here things are boring and fucked up as hell, just like the most of the Dark Side.
LEVEL 6 - THE NOT SO IMPORTANT
This layer stops the total madness and starts promoting the hackers. Yeah, everyone who wants to reach Level 7 passes through here. This Level is not really important, but who cares?
LEVEL 7 - THE FOG
Once you get here you can't escape. This is where the battle for supremacy starts. Hackers and others are everywhere, fighting to reach Level 8. No one did it yet, but it can't be you (or anyone else).
LEVEL 8 - THE UNKNOWN
Nobody knows what secrets this Level holds, in fact nobody knows what it is. It has been discovered from some Super Deep Web scans, being considered an anomaly. Nobody has control of it and nobody can enter in it: it's impossible for our computer to break it's lock (ironically, people still fight for it's total control).
Well, this is all. I hope this revealed some parts of the Internet. Oh, yeah, take a look at this: http://9gag.com/gag/4752977.
Oh, yeah, don't ask for the link, it's too dangerous.