Tour the Catacombs of Priscilla: On Google Maps

Fascinating.  

See here:

https://maps.google.com/maps?ll=41.929305%2C12.509084&cbp=%2C109.0%2C%2C0%2C-0.0&layer=c&panoid=sfiLnF1scbgAAAQJOCH0Sw&spn=0.18000000000000152%2C0.30000000000000043&output=classic&cbll=41.929305%2C12.509084