Baths of Antoninus

Listen first. Somewhere beyond the stone, the sea breaks softly against the shore. A breeze comes in off the Gulf of Tunis, carrying salt and the faint smell of pine. Under your feet, the ground is a mix of sand, gravel and broken masonry, warm in the sun. Around you, huge blocks of pale stone lie in rows, like the bones of something very large. This is what remains of the Baths of Antoninus, once the greatest public bathhouse in Roman Africa.

To understand this place, it helps to know what Carthage was. Long before Rome, this was a Phoenician city, a rival power that fought Rome across the Mediterranean. Rome destroyed it in the second century before Christ. Then, about a century later, Rome rebuilt it as a Roman city. By the time these baths rose, Carthage had become one of the largest cities in the western empire. It was a capital of grain, trade and learning.

The baths take their name from the emperor Antoninus Pius, who ruled in the middle of the second century after Christ. Work on the complex is generally linked to his reign, and it was a gift on an imperial scale. A Roman bath was not just a place to wash. It was a social centre. People came to exercise, to gossip, to do business, to read, to be seen. For many citizens, a visit to the baths was a daily ritual.

Now look at the scale around you. The complex stretched along the seafront, and scholars count it among the largest bath buildings anywhere in the Roman world. Here is the first surprise. What you are walking through is mostly the basement. The grand halls, with their marble floors and high vaulted ceilings, stood above this level. Almost all of that upper world has gone. You are standing in the service floor, among the foundations.

This lower level was the working heart of the building. Slaves and workers moved through these passages, out of sight of the bathers above. They fed the furnaces with wood. They kept the fires burning that heated the water and the floors. Romans heated their baths with a system called a hypocaust. Hot air from the furnaces flowed through spaces under the floors and inside the walls, so the rooms above stayed warm.

The bathers followed a set path through a series of rooms. They usually began in a warm room, moved to a hot room, and then finished with a plunge into a cold pool. These rooms had Latin names: the tepidarium was the warm room, the caldarium the hot one, and the frigidarium the cold hall. In large imperial baths like this one, the plan was symmetrical. Two matching sets of rooms mirrored each other on either side of a central axis.

All of this needed an enormous amount of water. Carthage received its water through a long aqueduct that brought fresh supplies from springs in the hills to the south, near Zaghouan. You can still see sections of that aqueduct elsewhere in Tunisia, striding across the countryside on stone arches. The water was stored in great cisterns in the city before it reached buildings like this one. The engineering behind a single hot bath was remarkable.

Now find the tall column standing alone above the ruins. This is the second surprise. That column was raised again in modern times to show visitors the height of the original building. Look at it, and then imagine the ceiling far above even its capital. The halls of the baths were taller still. A single column gives your eye a measure. The rest you must build in your mind, layer by layer, up into the open sky.

Walk closely past the stone and you will notice the different materials. There are large dressed blocks, rougher rubble cores, and traces of brick. Here and there, fragments of carved decoration lie on the ground. Pieces of marble, column drums and capitals rest where archaeologists placed them. Much of the finer stone was carried away over the centuries. Later builders treated the ruins as a quarry, and Carthage stone ended up in buildings far beyond this shore.

The decline of the baths followed the decline of Roman power in Africa. In the fifth century, the Vandals, a Germanic people, captured Carthage. Later, the Byzantine Empire, the eastern continuation of Rome, took the region back for a time. The great building suffered damage and neglect through these changes. By the end of antiquity, the life of the baths was over. Sand, earth and time slowly covered what remained.

Today the site is part of the archaeological area of Carthage, which UNESCO lists as a World Heritage Site. The ruins sit inside a landscaped park, with paths, trees and open lawns. It is a quieter place than you might expect. Families walk here, students sketch, and the sea stays always in view. Nearby are the residential streets of modern Carthage, with white walls and blue details, a calm suburb of the capital, Tunis.

Take a moment at the edge of the site closest to the water. The Romans placed these baths here for a reason. Bathers in the upper halls could look out across the gulf as they moved between the pools. The same view is in front of you now. On a clear day, you can see the mountains on the far side of the bay. The sea, the light and the horizon have hardly changed since the second century.

Before you leave, stand still among the stones again. Feel the warmth they hold from the sun. Listen to the waves, and to the wind moving through the pines. Thousands of people once crowded this spot every day, talking, laughing, sweating in the steam. Now there is only the sea and the quiet. As you walk away, look back once at that lone column against the sky... and remember how much taller this place once stood.