The Baths of Caracalla was one of the grandest Roman baths, built in 216 AD. It was named after the Roman emperor, Marcus Aurelius Antonius, who was best known as Caracalla. The baths of Caracalla had many rooms including different temperature bath rooms, libraries, gyms, gardens, and much more. The baths were open to virtually anybody in Rome for free except for slaves. The baths used very advanced heating systems at the time, which made it very effective.