The Heavenly City in the clouds symbolism is often seen on older tombstones.
“In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.” (John 14:2)
The columns and the open gates show the entrance to Heaven and the path leads the way to the city in the clouds. The divine star guides the way.
Unfortunately, many of the old marble monuments are weathering badly and their inscriptions and images are becoming difficult to read.