The church itself is essentially Romanesque, but it is characterised by a complex layering of buildings and structures, among which the hidden gem is the crypt which dates from the 6th century.

It consisted primarily of headstones covered with inscriptions, dating from the Gallo-Roman period of Cularo.

[3] A museum opened in 1986, in the deconsecrated church of St Laurent, but closed from 2003 for work, and reopened to the public in May 2011, with a new original staging.

The conservation status of the church funeral (sixth century) excavated in the basement, with its crypt makes it a unique archaeological site in France.

[5] The site, from the early fourth century mausoleums, has witnessed an architectural constant adaptation to changing attitudes, pagan practices to Christian beliefs.