San Gennaro extra Moenia ("San Gennaro Beyond the Walls") is a church in Naples, Italy. It is located in the Rione Sanita on the large road that leads up to the Capodimonte museum and is an example of so-called paleo-Christian architecture in the city. This ancient basilica was then reformed in the fourth century AD and expanded between the 11th and 15th centuries. The church became a hospital in 1648. The church is still contained within the complex of the larger hospital structure. The premises provide access to the extensive catacombs themselves.