By OnMilwaukee Staff Writers   Published Jul 30, 2012 at 11:41 AM

Explore one of Wisconsin's natural wonders on the anniversary of its discovery as Cave of the Mounds hosts its annual weekend celebration Aug. 4 -5.

Cave of the Mounds will mark the 73rd anniversary of the limestone quarry blast that uncovered the caves with a variety of family-friendly activities, including flashlight tours, kid-friendly gem and fossil sluicing, the new Fossil Dig and Crystal Quest and more.

Special event times vary during regular open hours of 9 a.m. to 6 p.m. Guided tours leave every 20 minutes. For more information, visit