Completed by Caracalla in 216, these were much more than public baths. They were a complete sports center, with hot and cold baths, a swimming pool, dry and steam saunas, gymnastics and sports facilities, social rooms, gardens, libraries, hairdressers, and shops.
The massive and imposing structure covered an area of 300 square meters, a complex of gigantic halls whose domes and vaulting were supported by huge columns and piers.
It could accommodate 1,500 people at a time. The floors and walls were covered with marbles, mosaics, and frescoes; even in ruin their splendor is still evident.
