Vatican Necropolis - Tomb of the Chariot

This tomb, in the Vatican Scavi, is named for the picture on its mosaic floor - a quadriga (chariot).  In part, the Guide to the Vatican Necropolis describes this mausoleum - and its location below the floor of St. Peter's Basilica - as follows:

Located between the two eastern pillars of the dome parallel to the altar of St Peter in the central nave of the Vatican Grottoes, this building was invaded by the foundations of both the old and the new basilica. It was therefore one of the last mausoleums of the necropolis to be explored and only in 1946 was it possible to open the passage near the southeastern corner that now grants access to the sepulchre. A wall of tufa blocks and bricks replaced the original facade; it was built in the 4th century and used the door jambs of the travertine portal on which the legal measurements of the building were sculpted in indexed characters: twelve feet wide and fifteen deep (the side wall are three feet longer).

Credits

Photo from Guide to the Vatican Necropolis, by Michele Basso, published by Fabbrica di S. Pietro in Vaticano (1986).   Image online, courtesy St Peters Basilica.org.