A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This 19th-century religious artwork was once highly controversial—because it was donated to the church by a divorcee.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This large midwestern cavern features impressive rock formations and an underground waterfall.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

European castle ruins in an American state park are actually the product of death and grief.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One devoted couple has donated multiple recreations of Michelangelo's sculptures to this South Dakota town.

Elaborate drama imparts an appreciation for 19th century hardships.

A fitting attraction for the corn capital of the world.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

This massive roadside mascot was the first version of the giant to illustrate his butt.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.