What are some ways that fast, long-distance communications can exist without needing to have electronic radios?

I'm trying to think of ways that a humanoid civilization, post-agrarian with solid mechanical knowledge but no electronics, can communicate in near real-time over large distances.

Some of my initial ideas include communication by light towers, which would allow for direct site-to-site communications and would have interesting side effects of being ineffective during inclement weather; and communication by ground vibrations, which would allow for broadcast communications.

I'm trying to get more advanced than communication by messenger (although that may be a backup plan for the light towers) but I don't want to introduce electronics into the culture.

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What are some ways that fast, long-distance communications can exist without needing to have electronic radios?

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