The Grotto is a composite of nine separate Grottos, each portraying a scene in the life of Christ. The Grotto includes the largest collection of precious stones and gems found anywhere in one location. The artistry has to be seen to be appreciated, plus the message it gives is beyond words. It is frequently considered as the “Eighth Wonder of the World.” The Grotto has been placed on the National Register of Historical Places in 2001. The Iowan Magazine has described the Grotto as a “Miracle in Stone”.