Millstone is on the site of a huge network of quarries, which makes for some spectacular scenery while riding. On a warmer day, it would also be a great place to do some ledge jumping/swimming. Within the last few years, Millstone has invested quite a bit of money in developing a "second half" to its existing trail network, and this new half has lots of cool descents and other interesting features. And lots and lots of rock. The old network is pretty solid too, but more consistent with what you might find in Exeter, NH or Mt. A. in Maine.
Anyway, enjoy the photos and video (including a bonus video of Scott doing a clean run around a trail called Vortex). Clearly need to improve the camera angle going forward for these mountain bike posts, but we'll get there eventually. Also - credit where credit is due - thanks to Josh for a number of these pictures, his came out much better than the ones I took.
(shockingly, I made it down this ramp)