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 ...

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 ...

Iowa's state and county parks, unique museums, natural attractions, historical sites, and rolling hills along the Mississippi ...

Explore one of Iowa's limestone formations from the inside with a unique cave tour. Explore one of Iowa's limestone formations from the inside with a unique cave tour. Road Trip Iowa is available ...

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