This imposing structure, built of concrete with an elegant reddish bricl facing, was erected by the emperor Caracalla to ingratiate himself with the legionaries after the murder of his brother Geta.

It has a quadrangular ground-plan with buttressed towers at the corners.

The building was three storeys high, with the lowermost substructure being given over the service rooms while the other two floors were composed of vast airy halls with marble and mosaic floors and large arched windows.

In the Middle Ages the building was used as a fortress and later on it was converted into living quarters.

Nowadays we can still admire practically the whole structure.

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