Those umbrella/pinecone things

[-JKP-]

Many of these natural spas date back to the Roman era, and aqueducts were installed to direct some of the water, so if those pipe segments turned out to be aqueducts, it wouldn't surprise me.

These are from Ephesus (I may have already posted these some time ago, I can't remember). They don't have dots along the sides, but the specific designs and manufacturing methods were usually decided by local tradesmen, so they might vary somewhat according to region:

 

Here are some that are very pitted:

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They also used lead pipes (from Ostia antica):



Pipe segments in Pompeii:

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Pipe segments in Turkey:




Ellie has also posted some good examples of saltpeter tubes (which have rows of holes or indentations).