[NYer]

If someone could post pictures of this nativity, it would be most appreciated.

[DBeers]

I think this may be it:

[Carolina]

I loved St. Mary Major. It is probably my favorite place in Rome and it's like a jewel box dedicated to Our Lady. St. Jerome is buried in the crypt known as Bethlehem in Rome where the crib is found. The chapel fulfilled the stational Bethlehem so it was an ancient site of pilgrimage.

Here's the altar and tabernacle in the chapel above the Bethlehem crypt, aka the Sistine Chapel.

Here's the dome where every August 5th, white rose petals are dropped to commemorate the miracle of snow in 358 AD.

[Carolina]

A couple more pictures...

The ceiling and frescoes depicting the mysteries. Also, 5th century mosaics from the Old Testament. They're believed to be the oldest mosaics in Rome and there are 36 panels all around the architrave above the columns.

And the baptistry..