CIMRM Supplement - Mithraeum. S. Giovanni di Duino, nr. Venice, Italy.

The Duino Mithraeum. From: here.

From Wikimedia Commons. By Rasevic, July 2009.

Central tauroctony. From here. By Rasevic, July 2009.

Well. From here. By Rasevic, July 2009.

Entrance to Mithraeum. From here. By Rasevic, July 2009.

Altars at entrance. From here.

Inside the entrance. From here. By Rasevic.

Inside the well. From here. By Rasevic.

A Mithraeum was discovered in 1965 near Venice at San Giovanni di Duino (generally known as the Duino Mithraeum).

Grotta del Mitreo di Duino - Discovered: 1965 in a cave near the Duvino River close to Trieste. Coordinates: 45° 38' 00" N, 13° 48' 00" E / 45.6333° N, 13.8000° E¹

According to the Wikipedia article (written by "Rasevic", the photographer):

The Duino cave is located about two kilometers from the sources of Timavo river. At the center of the cave there are two benches and a square block of limestone that served as an altar during religious ceremonies. The lower wall has a plaque on two columns depicting the tauroctony, a standard iconic feature of the Mithraic Mysteries. 400 coins, oil lamps and a large number of jars were found in the cave.

The first image above has the note:

"La Soprintendenza per i beni archeologici del Friuli Venezia Giulia ha annunciato la riapertura della Grotta del Mitreo o Grotta del dio Mithra presso San Giovanni di Duino (TS), con la possibilita di visitarla tutti i gioveda dalle 9 alle 11."

Bibliography

Taken from Roger Beck, Mithraism since Cumont.

GORDON, R. L. 1976d. "Archaeological report: Italy, Germany, Hungary." JMS 1, p.197-201.
STACUL, G. 1971-72. "Scavo nella grotta del Mitreo presso San Giovanni al Timavo." Atti dei Civici Musei di Stor. ed Arte di Trieste 7, 5-30.
STACUL, G. 1976. "La grotta del mitreo presso San Giovanni di Duino". Antichira Altoadriatiche 10, 29-38.
Cannarella, Dante, Arti Grafiche, & Pacini Mariotti. "Atti della Societa per la Preistoria e Protostoria della Regione Friuli Venezia Giulia" 3, Pisa, 1979. Pp. 101-102.