the scp foundation. they bill themselves as a collaborative writing website, but it's basically a database of user-submitted articles of all the creepy shit that "the foundation" has found and kept locked up. the top rated pages are a good place to start: http://www.scp-wiki.net/top-rated-pages
there was also a game someone made for SCP-087 (http://www.scp-wiki.net/scp-087), which mostly springs to mind because that's how i found the site, but it's still pretty creepy.
Re: for creepypasta anon!
http://www.scp-wiki.net/
the scp foundation. they bill themselves as a collaborative writing website, but it's basically a database of user-submitted articles of all the creepy shit that "the foundation" has found and kept locked up. the top rated pages are a good place to start: http://www.scp-wiki.net/top-rated-pages
there was also a game someone made for SCP-087 (http://www.scp-wiki.net/scp-087), which mostly springs to mind because that's how i found the site, but it's still pretty creepy.
http://www.indiedb.com/games/the-stairwell-scp-087/downloads/the-stairwell-scp-087
on that note, if you haven't played slender yet...
http://slendergame.com/