One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

Where beautiful signs live on forever.

A forgotten sea village stands silent after hurricanes deemed it obsolete.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

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

This elaborate towering structure was once famed for its revolutionary height.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A haunted hill that supposedly defied gravity.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

Steepest flood safety railway in the entire world.

The world’s first penitentiary, meant to be humane, drove men insane.

Hundreds of protractors affixed to surfaces all over the city.

There aren't too many operational funiculars around, but Pittsburgh has two!

This university transit system is a 1970s vision of the future.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

Low-frequency noise compared to an idling train can only be heard by some of this industrial town's residents.