This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

This public park was the site of the largest civilian disaster of the Civil War.

A field of nothing but boulders which resembles a giant's gravel driveway.

It would take 35 firetrucks to fill this enormous glacial pothole.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

An abandoned stretch of highway, deteriorating next to the operational one.

A toxic ghost town sitting atop a massive coal fire.

This semi-spooky remnant of an abandoned hotel provides fantastic views.