This image shows the mausoleum of Charles II, Duke of Brunswick, who bequeathed his entire estate to the city of Geneva with the requirement to build this specific monument.
Georges Jaeger, Editeur, Genéve
There is no description on the back of this card.
The monument was constructed in 1879 along the Lake Geneva waterfront in the Garden of the Alps.
This postcard likely dates from the 1920s.