What would be correct for a caption? A Classroom in France or Classroom in France
Those are both possible. The omission of the article is a style choice, as is the capitalisation of the word "classroom" in "A Classroom in France". By omitting the article or capitalising "important" words you are treating the caption as you might a heading or headline.
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Those are both possible. The omission of the article is a style choice, as is the capitalisation of the word "classroom" in "A Classroom in France". By omitting the article or capitalising "important" words you are treating the caption as you might a heading or headline.
I would probably choose to write it as