Tomb of Caecilia Metella reveals secrets of Roman concrete resilience

The tomb of Caecilia Metella, the turret-shaped funerary monument on the Via Appia Antica outside the ancient walls of Rome, was built out of concrete, brick and travertine between 30 and 10 B.C., a time when Roman architecture saw major advances in concrete construction. The circular concrete tomb was faced with blocks of travertine and …