An ancient Roman gladiator school has been discovered in Austria, complete with cell blocks, a training arena and a bath complex, archaeologists say.

The buried remains of the school — at the site of Carnuntum, near Vienna — were detected not through excavations but through remote-sensing techniques. Based on these findings, researchers reconstructed the gladiator center in virtual 3D models.

Archaeologists have been studying Carnuntum, which is on the south bank of the River Danube, for more than 100 years. Previous excavations at the ancient military city had revealed parts of the civilian town, the legionary fortress and an amphitheater....