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The only Mithras Temple in Europe is housed in a natural cave.
A short drive west from Trieste and just above the town of Duino, in the Italian region of Friuli-Venezia Giulia, there is a Roman Mithraeum that dates to the first century B.C. There is a Roman Mithraeum that dates to the first century B.C. Surprisingly, it was found in a seemingly random spot on the karstic hills of the Trieste Gulf. The temple was dedicated to those who worshipped the god Mithras and followers of the Mithraic mysteries. Most Mithraeae are found in what was the Ancient Roman Empire. Although Mithras derives from the Zoroastrian divinity Mithra, the Roman mystery religion has its own separate imagery and set. This ancient religion was common among the army, which is likely how it ended up in a seemingly random spot on the karstic hills of the Trieste Gulf.