The Santuario di Vicoforte is a monumental church located in the commune of Vicoforte, province of Cuneo, Piedmont, northern Italy. It is known for having the largest elliptical cupola in the world.
Wikipedia https://en.wikipedia.org/wiki/Sanctuary_of_Vicoforte
Coordinates 44°21'48.961" N 7°51'46.267" E