caldaria

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$Broken column and brick arch of the Large Baths Hadrian\'s Villa Tivoli Italy Roman ruins Unesco World Heritage Royalty Free Stock Photo$

$Arched hall and marble columns inside the Great Baths Hadrian\'s Villa Tivoli Italy Unesco World Heritage ruins Royalty Free Stock Photo$

$Lofty arches and marble pillars inside Great Baths Hadrian\'s Villa Tivoli Italy Unesco World Heritage ruins Royalty Free Stock Photo$

The underfloor heating system of a room which was a hot plunge bath - the Caldarium - used in a Roman bath complex. Excavated in Germany.