Before revision: Eternal Flame Falls in New York has an eternal flame inside a small grotto behind the falls Grutas de García in Nuevo León, Mexico A grotto is a natural or artificial cave used by humans in both modern times and antiquity, and historically or prehistorically.
After revision: (grotMerriam-Webster's Unabridged Dictionary 2.5, 2000)Eternal Flame Falls in New York has an eternal flame inside a small grotto behind the falls Grutas de García in Nuevo León, Mexico A grotto is a natural or artificial cave used by humans in both modern times and antiquity, and historically or prehistorically.