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In the modern world, most of us wouldn't give a second thought to the source of the hot water running through our taps.
And neither did the 5,000 Romans using the Baths of Caracalla everyday more than 1,800 years ago - but if they had, the steamy secret was being kept right under their feet.
Hundreds - Slaves - Night - Burnt - Tonnes
Hundreds of slaves working through the night burnt tonnes of wood in 50 brick ovens to ensure the water was hot 24 hours a day, reports the Times.
Now one of these ancient ovens that helped supply 15 gallons (70 litres) of water a second through tunnels underground is going on display for the first time.
Director - Marina - Piranomonte - Times - 'This
Director Marina Piranomonte told the Times: 'This is the technological heart of the baths. Everyone should see it — not just academics with torches.'
The Terme di Caracalla was built in 216AD while Emperor Caracalla ruled, and remained in use cleaning 5,000...
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