The Sanctuary of the Madonna of San Luca is a basilica church in Bologna, northern Italy, sited atop Colle or Monte della Guardia, in a forested hill some 300 metres above the plain, just south-west of the historical center of the city. This is the dome where ends the 3.5km long arcade (composed by 666 arches) that climbs the hill from the city.

The original equirectangular image is here.

Source: Wikipedia