Long-shot of nave and apse with original mosaics dating to the time of Justinian. Note that in the center of the nave is an altar. This ancient altar is in the north African position.

Note the steps leading up to the apse and in the center-left the two visible squares with holes on which once stood two of the columns supporting the baldacchino over the altar.

Apse of Agios Georgios with vestiges of the apse mosaic showing Christ.

Apse mosaic of Sant'Agnese attended by bishop and other figure.

Model of apse of San Sebastiano showing original mausolea attached but outside the church on sloping ground.

One might also note the undulating landscape which originally gave its name to the catacombs. Pilgrims said that they were going to "ad catacumbas", or the hollows--meaning the hollows around the church of San Sebastiano. ...

Nave and apse of Sant'Agnese showing mosaics.

Model of ambulatory in San Sebastiano giving access to larger number of burials contiguous to a closer burial to the site of martyrs.

Apse of church with door leading into the balcony.

Foreground steps leading into the apse, an apse with a synthronon in the rear.