The National Sanctuary of our Sorrowful Mother, popularly known as The Grotto, is a Catholic outdoor shrine and sanctuary located in the Madison South district of Portland, Oregon, United States. Constructed in 1924, the sanctuary covers 62 acres, and is set both at the foot of and on top of a 110-foot cliff. A large meditation hall whose main chamber is at clifftop level extends down to the foot of the cliff; the cross on the hall is visible many miles away.