In a Roman bath complex, a caldarium was a room with a hot plunge bath. This area was heated by a hypocaust, an underfloor heating system that used hot air tunnels managed by workers, creating a highly hot and steamy atmosphere. In the standard order of bathing rooms, this was the hottest one; bathers would proceed from the caldarium to the frigidarium via the tepidarium. A hot water bath submerged in the floor may be found in the caldarium, and occasionally a laconicum—a hot, dry place design ... (Read More)