This cave holds a surprisingly colorful variety of geological oddities.

Former hotel turned into haunted playground.

The first artificial white water river course in North America cuts right through an Indiana city.

Robots, lasers, and whoopee cushions, oh my!

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

Moving, mind-blowing metal sculpture work of an outsider artist.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

A science teacher's dream.

Cemetery featuring rare glass-fronted columbarium.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

This cemetery is all that remains of a school for "wayward" girls.

World's second largest particle accelerator, where nature reveals its secrets.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

Take a break from all the boring business of death at this funeral home mini-golf course.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Shop of curiosities with a dinosaur museum tucked in its basement.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

The final resting place of the world's first nuclear reactor.