The Lead Adventure Forum is my 2nd favourite, but their nomenclatural system defies comprehension. It appears that Spring and Falls Chinese aren't ancient, but Vikings and Incas are, that Ned Kelly was part of the Wild West, and Vietnam is frequestly not part of the Far East. 18th century ships of the line somehow count as pike and shot; there's no consistency about the real renaissance, which ends up on the medieval board half the time; Huns are medievals too....
Einstein would have been fascinated by LAF temporals, but I think only Star Trek could take them seriously.