Put simply, a grotto is a small cave or overhang ... is enough space to enjoy and use the hidden grotto, particularly ...

This fully furnished listing includes a secret wine tasting room and a 116-foot water slide that plunges into an underground pool grotto and enough solar power to live off the grid for a month.

And one decadent hotel offers a lesser-known hidden gem dining experience ... a dinner in a man-made cave called El Grotto. I was greeted at the Oasis pool — a 5,000-square-foot, infinity ...