Athena Review Image Archive ™
Herculaneum: Men's Calidarium, apse
Herculaneum: Central Thermae, apse in Men's Calidarium (photo: Athena Review)
The calidarium or warm room of Roman bathhouses was heated by a subfloor furnace, with heated air channeled through vents called hypocausts.
This image shows the apse of the Men's Calidarium in the Central Thermae.
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