教室 vs 课堂（近义词）

1)Both nouns indicate a large room in a school where a class meets for a lesson.教室 refers to the actual room,while 课堂 can be used figuratively.For example,the usage of 教室：
2)Even 阶梯教室(lecture theatre),听力教室(Listening classroom )etc.,all refer to actual rooms..But 课堂 is different,e.g.:
3)课堂 in the two examples above are not actual rooms.One can even say: