A Virtual Experience: at the Vatican website

The Vatican website provides a "Virtual Visit" of the Basilica of St John Lateran (above) [with music]

Excellent

See

http://www.vatican.va/various/basiliche/san_giovanni/vr_tour/Media/VR/Lateran_Nave1/index.html

Similar "visits" are available for

The Sistine Chapel:

http://www.vatican.va/various/cappelle/sistina_vr/index.html

The Basilica of St Peter:

http://www.vatican.va/various/basiliche/san_pietro/vr_tour/index-en.html

The Basilica of St Paul Outside the Walls:

http://www.vatican.va/various/basiliche/san_paolo/vr_tour/index-it.html