The so-called Temple of Diana is a 1st-century ancient Roman building in Nîmes, Gard, built under Augustus.
It is located near the gushing spring of "La Fontaine", around which was an Augusteum, a sanctuary devoted to the cult of the emperor and his family, centred on a nymphaeum.
[3] Its roof construction is unusual in that it consists of several elaborate thick barrel-vaulted rooms using carefully cut ashlars supporting an upper floor.
The north side wall has a series of five rectangular niches surmounted by alternate triangular and semi-circular pediments.
The ancient opus sectile floor made of precious marble shapes of various colours backed by mortar was discovered the during the excavations of 1745.