metro line, archaeologists found not something like that, but a third century house destroyed by fire, but very well-preserved. >> complete with central heating systems, beams and the bones of a dog. ben wedeman takes a step back in time for this report. >> reporter: scratch the surface in rome and you find history. it's an archaeologist's paradise. but for officials overseeing the long, delayed construction to the city's newest subway line, line c, rome's embarrassment of ancient riches is a curse that keeps on giving. while digging a shaft for the subway's tunnel near the coliseum late last year, workers uncovered what appeared to be the charred remains of a luxurious home, complete with central heating, dating back 1,800 years.