"There is material to suggest that the earliest cult of Sulaiman-Too could be Mithraism. Mithra, one of the most ancient Indo-Arian gods, was later included in the Zoroastrian pantheon." (AB evaluation)

Under Santo Stefano Rotondo and Basilica di San Clemente

Nisa Was called "Mithradatkert". Among its kings were Mithradates I and II (= "Given by Mithra"). Mithraic mausoleums and shrines have been uncovered

Consecration stones for Mithras have been found in Dormagen (Durnomagus).
See de.wikipedia.org

Rudchester Mithraeum at Hadrian's Wall

Fertorakos Mithraeum

Mithraeums were found in several locations, such as Künzing and Linz. The Mithraeum in Pöchlarn (ID No 18d) "is the only one preserved on the northern Danube limes and is directly connected with the military units garrisoned here." (Nomination file, p. 72) Several Mithraeums were discovered at Carnuntum (ID No 31). Mithraeum III, located in the western part of Petronell, was probably built in the late 2nd century and was one of the largest sacred buildings in Carnuntum.
See de.wikipedia.org

The property includes "[r]eligious buildings and places of worship" such as "mithraea". (AB Ev)