Florences Duomo, painted in oil on linen from the site of the church of San Donato a Scorpeto which is a ruin now but the plateau atop the hill is a calm isolated space, perfect for painting. The church was the home of Leonardo da Vinci's painting, the 3 Magi.

Painted in oils on linen.
Measuring 35 wide x 45 high in centimeters
or
24 wide x 18 high in inches