what is a grotto
A Marian grotto in Bischofferode (Germany). A grotto (Italian grotta and French grotte) is any type of natural or artificial cave that is associated with modern, historic, or prehistoric use by humans.rotto in an iceberg with the Terra Nova ship in the background (1911) during the 'British Antarctic Expedition' by Herbert G. Ponting. Grotto of the Buttes-Chaumont in Paris. Grotto pavilion in Kuskovo, Moscow (1775).