[2] They include two arched entryways, a bridge, a ten-column structure representing the Ten Commandments, and a canopy enclosing a marble statue of the Virgin Mary.

He utilized 12 tons of stone and 300 varieties of Italian mosaic glass that he acquired in his travels of more than 40,000 miles (64,000 km).

[3] Popular in southern Europe, grottoes are natural or artificial caves that are places of spiritual reflection.

In the United States, they are found primarily in the Midwest, and are created mostly by self-trained artists and builders.

This article about a property in Linn County, Iowa on the National Register of Historic Places is a stub.