Archaeologists in Rome have discovered the remains of a sprawling residence of a Roman military commander dating back 1,900 years and holding several rooms covered in ornate mosaic floors with geometric patterns, along with pools and fountains.

They discovered the "domus" about 40 feet (12 meters) underground during construction work to expand the Metro C line of Rome's subway system, a team of archaeologists from Rome's Superintendency for Archaeology announced recently.    

The commander's residence was uncovered alongside the remains of a military barracks used by Roman soldiers that was discovered in 2016 during this same subway construction.