These sites are termed "Deep Web" or "Undernet." They exist outside the scope of Google, Facebook, and your RSS reader. It's the digital equivalent of a thriving city that's been domed over and cordoned off.
while I am not advocating anything illegal this article actually shows what is available that stays out of the mainstream media:
There are several websites claiming to offer some crazy goods and services through Tor:
Silk Road is dubbed the "Amazon.com of drugs." Gawker published a story on the site. Through Bitcoin, a secure and anonymous digital currency that can be exchanged for real money, vendors are able to set up shop digitally and sell their wares through the U.S. Postal Service. (It's important to note that Bitcoins are cash equivalents, so if someone rips you off you have no recourse.)
EuroArms sells and delivers weapons (without ammunition).
You can hire assassins through a service called "White Wolves."
Child pornography is readily available through countless sites.
The Human Experiment details medical experiments performed on people against their will.
Just because the Deep Web is a place where the id tends to run wild doesn't mean others aren't finding legitimate and creative uses for it:
Young & Sick is a Los Angeles-based fashion, art, and music project that released its newest single, "Continuum," via Tor earlier this week.
Originally developed for use by the Navy, Tor has plenty of military applications in how it protects communications and intelligence gathering.
WikiLeaks provides users with means to upload documents anonymously.
There's A Secret Internet For Drug Dealers, Assassins, And PedophilesMar. 6, 2013,
http://www.businessinsider.com/tor-silk-road-deep-web-2013-3?op=1