I have a box at home . . .
. . . inside my router/firewall, running PcAnywhere.
Also running TightVNC.
Anytime I'm worried that some site may raise a red flag, or if I'm not interested in leaving breadcrumbs (at least until I know what the site is about), I remote into my home box and do the deed from there.
I sacrifice a little speed, but I don't risk compromising a work box and then having to 'splain to IT why my box is fubar.
Some conservative content sites are blocked by IT, though they insist they're not. For those, I bounce off the home box.
If the question arises what that IP address is (with no HTTP server on it), I just tell them it's my home box. I've been asked a couple of times why I connect there. I explain that I don't do personal mail or related stuff on the work box, so I connect there to do it, in the interests of corp security.
They respect that. They also have no rational justification for blocking my home box, since I also work from home after hours.