The tomb of the ancient Roman Scipio family has been restored and opened to the public on guided visits, according to this article. Although sarcophagi and inscriptions have been moved to the Vatican Museums, visitors can see reproductions as well as tomb niches and frescoes in the tunnels. Guided tours (currently in Italian only) are given on Saturday mornings, see the above article link for details.
The Scipio Tomb is on Via di Porta Sebastiano near Via Appia Antica, the Old Appian Way (see photos), where there are many catacombs, some of which are open to the public. The location of the Scipio Tomb and catacombs are shown on this Appian Way Map. One of the most famous members of the Scipio family was Scipio Africanus, the Roman general who defeated Hannibal in the Second Punic War.