For the first time in history, archaeologists have mapped an entire ancient Roman city using ground-penetrating radar. According to The Guardian, the buried town of Falerii Novi contained a bathhouse, theater, several temples and shops, and a large monument of a kind experts have never seen before.

Once a proud, 75-acre outpost 31 miles north of Rome, Falerii Novi was built and occupied in 241 B.C. and abandoned in 700 A.D. Though it’s been thoroughly buried over the course of time, new technology has allowed experts to see through layers of ground and map the town in detail without digging.