ancient roman hypocaust system elevated pillars underfloor heating preserved thermal bath ruins |
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| navigate by keyword : wood wall temple stonewall soil sculpture rock relief pattern iron flooring floor carving brickwork brick art hypocaust roman bath ancient heating underfloor architecture archaeology thermal technology engineering ruins stone pillars history heritage old structure historical site innovation archeological empire preserved |
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| Close-up of a Roman hypocaust system showing rows of stone pillars once supporting heated floors in a thermal bath. Ingenious ancient underfloor heating technology. |
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