peter's. and around that place where his bones are is built st. peter's bacilica. >> had constan teen built a church in the vatican, he certainly thought peter was buried there, and this is why he initiated this large building project, to commemorate peter. >> but did peter live, preach and eventually die in the eternal city? to try and discover the truth, professor tom and dr. george are carbon dating a relic believed to be from peter. >> george, the results for the st. peter tooth is about to come off the ams. we should see the result any second now. it's coming out at 250 to 340 a.d., so, it's old, but it's not as old as st. peter.