Since there are many members who have joined since this was last posted...
People have been known to spend all day drooling over the stuff pictured on this website. Many of the pieces are unique. What's interesting is that many are still mounted on the original carriages with which they were issued centuries ago. The 40 (?)-barrel rotary mortar is one of my favorites. I've written this museum many letters volunteering to serve as a night-watchman, for free, but haven't heard back yet.
http://www.xenophon-mil.org/rusarmy/artymuseum/arttbl.htm