What was your Favorite Server you ever played on?

Just as the title asks, I want to hear about your favorite server(s). I'd say for me, I've had one real server as my favorite. As smug as it may sound, but it was my own. A couple years ago I had ran an American Airborne WW2 Roleplay server. I tried to get a good mix of roleplay and solid combat, and the guys in my community loved it. I had averaged 30 players a day, maxing at 40 at one time. It was really fun to actually have a community of guys I could play and hang with, and all the regulars on the server knew each other. It was an awesome experience, and that's the main reason I've come back to GMod, more specifically back into making a server soon. What about you guys?