These are the remains of a Roman villa built during the Republican Age and located on the 15th mile of the Via Appia, at kilometre 23 of the State Road Via Appia, inside the Villa Santa Caterina, owned by the Pontifical North American College.
The site has been identified as the villa of the tribune Publius Clodius Pulcher, located, according to Marcus Tullius Cicero, close to the ancient town of Alba Longa.
In August of the year 54 b.c., Clodius was killed close by the villa by assassins sent by his political opponent Titus Annius Milo.
What’s remains of the villa are the paved access side-street, part of the peperino portico and all the north-western wing, dated around the II C. b.c.. The entire construction was made out of small irregular tufa blocks, a standard building technique during the Age of the Republic.