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.