Roman bathhouse, Messini
At the Roman bathhouse in Messini we can clearly see how the floor was heated: the warm air from a boiler house was led through pipes to hollow spaces under the raised floors under the bathhouse. The many columns seem to improve the circulation of the warm air.
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When you don't see the puzzle, please check whether your device can handle html5 or java. Read here why the puzzles look different and which problems there can be