The Jajce Mithraeum, or Jajački Mithraeum () is a temple (Mithraeum) dedicated to the Persian invisible sun god, Mithra. It was rediscovered in an archaeological dig in 1931 in Jajce, Bosnia and Herzegovina. History Mithra was worshipped throughout the Roman era, from the late Republic to the later Imperial era. The cult of Mithraism spread from the Middle East to other parts of the Roman Empire throughout the Mediterranean basin, at first by military-political adventurers, travelers, slaves and merchants from the Orient. Later, Mithraism was spread by soldiers whose legions came into contact with the followers of the cult in the East. The temple dates to the early 4th century AD, although it could be as ancient as the 2nd century AD with repairs undertaken during the early 4th century AD. This particular Mithraeum is one of the best preserved sites in Europe. The Jajce site is a typical spelaea. Mithraism followers typically sought to set up their places of worship in caves. In absence of such topographical features, they excavated the soil and built small single-celled temple (spelaea) to reinforce the impression of a cave. Discovery and protection The remains of the Mithraeum in Jajce were discovered accidentally during excavation for the construction of a private house in 1931. The site was purchased by the Society for the Preservation of Antiquities in Jajce and soon after a protective stone and mortar structure was constructed under the supervision of engineer F. Steiner. This structure was repaired in 1952 and survived until 2012, despite significant damage suffered during the Bosnian War. A new facility replaced the previous one following the 2012 renovation, which cost approximately 260,000 KM (BAM) and was carried out under the MDG-F program "Promotion cultural understanding in Bosnia and Herzegovina" with the financial support of the Kingdom of Spain government. The temple is now protected by a modern steel-and-girder cage with glass walls that allows visitors to see inside without entering. Visitors can enter with advance notice by contacting the Ethnological Museum of Jajce. The Jajce Mithraeum is declared a National Monument of Bosnia and Herzegovina, and, including the old Jajce walled city core, the waterfall and other individual sites outside of the old city perimeter, as part of wider areal designated as The natural and architectural ensemble of Jajce, proposed as a UNESCO World Heritage Site list. The natural and architectural ensemble of Jajce is currently placed