I've gotten over 25 million unique visitors to my site, WreckedExotics.com since I launched it 10 years ago.
Here's a screenshot of the google analytics:
http://i.imgur.com/gz9hJ.jpg
It's missing 3 years worth of data - and those were some of the highest traffic years, so essentially, the site has done over 1 billion pageviews. Best month was 1 million visitors. I run the site by myself.
I also created http://www.exoticspotter.com which attracts over 1 million visits per year and am working on a 3rd site that attracts about 500,000 visits per year.
I was just lucky to get the traffic - basically started a site that was naturally viral. I don't know how to program, I just know how to code HTML/CSS, so I've been running it as a completely static site this entire time. It needs an update badly.
The traffic took off almost immediately, I had it on a hosted server that crashed and I got a bill for almost $1,000 for overages. Moved it to a dedicated server and the rest is history.