I've had the good fortune of taking the Scavi tour in Rome several times, and let me tell you, it is spectacular and inspiring. And you can take it today, right now, in fact, without getting out of your chair.
Rome Reports says:
If you want to visit the tomb of St. Peter and the Vatican necropolis, it’s no longer necessary to book tickets and travel to Rome.
The Vatican website now offers an exciting virtual tour through interactive high quality images. With just one click you can skip the queues and get into the foundations of St. Peter's Basilica.
The virtual tour also includes explanations of the most relevant details of the necropolis, and a map showing your location at all times within the necropolis towards the tomb of St. Peter.
You will have one of the best guides possible for your visit: Cardinal Angelo Comastri, president of the Fabbrica of St Peter’s, which looks after the necropolis.
An amazing look at the origins and construction of St. Peter's Basilica, available from any computer in the world.