Visit the stunning crystal formations of Crystal ... The cave opened in 1932, making it the longest-run show cave in Iowa. Crystal Lake Cave is open on Saturdays and Sundays from 9 a.m. to 5 ...

Researchers from the University of Northern Iowa are exploring some of the nation’s deepest caves to learn about life in ...

And if that wasn't enough of a draw, Maquoketa Caves is completely free to enter! Read more: All Of The US National Parks That Are Free To Visit Year Round Iowa is not exactly high on most people ...

A team of NASA-funded University of Northern Iowa researchers is exploring some of the deepest caves in the United States to ...

Traverse 330 steps on the way to such distinctive chambers as the “Devil’s Kitchen” and the “Crystal Vault.” Wild caving ...