■ 212 years Golden ratio of Baths of Caracalla in Rome

The Baths of Caracalla were built during the reign of Emperor Caracalla from 212 to 216.

The building is 225m long, 185m wide and 38.5m high. 2000-3000 bathtubs could be installed. The Baths of Caracalla are also built of Roman concrete and are designed with a golden ratio ratio.

The Baths of Caracalla were heated by the ancient Roman central heating system "Hypocaust". This creates a space by lifting the floor surface with pillars, sending hot air and smoke from the furnace (ro) to the underfloor and walls, and exhausting it with a pipe near the roof. A pioneer of modern central heating.



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