The structure was completed in 1937. It is operated by the U.S. Army Corps of Engineers and offers tours on Sundays at 2 p.m., Memorial Day-Labor Day. There is a gift shop, the viewing porch, botanical library and the vista decks located in the visitor center. Although, admission is free, donations are appreciated.
Tours are available.
The Mines of Spain is a 1,380-acre area rich in natural and historical significance which includes the E. B. Lyons Prairie Woodland Preserve and the Julien Dubuque Monument. The area includes steep, wooded limestone bluff lands, remnants of early 1800s era lead mines, an interpretive nature center, displays and hiking trails. All rights reserved.