The 360 photo shows the internal nave and dome of the "Basilica di S. Maria delle Grazie", Holy Mary of Grace. The church was built during the second half of 15th  century and was part of a domenican convent.  Luckily it received only limited damages by the heavy bombing on Milan in WWII. Clean and delicate frescoes from the 15th and 16th centuries cover the vaults and the the dome, that is unusually bright thanks to the many windows designed by the famous architect Bramante.  Just outside the front door on the right there one can visit the famous painting "The last Supper" by Leonardo Da Vinci. This Basilica is listed as a UNESCO World Heritage Site.