August 1, 1993

Historical marker location:

57 North Leonor K Sullivan Boulevard, Saint Louis, Missouri

( Marker can be reached from North Leonor K Sullivan Boulevard, 0.3 miles south of Lucas Street, on the right when traveling south.)

The town of Bonne Terre, Missouri, has the largest underground lake in the United States. The Bonne Terre Mine was once one of the world's largest lead mines, but is now a popular scuba diving destination.