The Mu-Ray project is funded by the Istituto Nazionale di Fisica Nucleare (INFN, Italian National Institute for Nuclear Physics) and the Istituto Nazionale di Geofisica e Vulcanologia (Italian National Institute for Geophysics and Volcanology). The Mu-Ray project is committed to map the inside of Mount Vesuvius, located in Naples, Italy. The last time this volcano erupted was in 1944. The goal of this project is to see inside the volcano which is being developed by scientists in Italy, France, the USA and Japan.