The Scavi or undergound necropolis of St. Peter''s Basilica is ground zero for the Catholic church. By going underneath the basilica and seeing firsthand how the city has been layered over the centuries, you''ll easily understand how St. Peter''s remains could have been "misplaced".
You''ll be assigned to a group of no more than 15 and your guide will lead you back into another century when Romans buried their ancestors in these literal "cities of the dead." The excavation is continual and recently better lighting has been added. Reservations are a must: send an e-mail to uff.scavi@fabricsp.va. Try to give a range of dates and language preference in your request as tour availability is limited. You will have to pay the full amount (at that time is was$ 8 US/person)in advance via personal bank draft or money order.
If you want to see just St. Peter''s tomb and not the underground city, you can enter via the Basilica.