NUST MISIS scientists and institutional collaborators have published the first results of a scan obtained by muon radiography of the underground space in the Derbent fortress of Naryn-Kala. The hypothesis of archaeologists regarding the use of the building as a Christian temple is most likely to be true. If this theory is confirmed, this building is one of the oldest churches in the world.
Click here for original story, The first 3-D images of the oldest Christian church in Russia obtained via muon radiography
Source: Phys.org