Just a man taking his prehistoric pet for a stroll.

Mark Twain once stopped at this rest station during his journey to Nevada.

Native Americans built this circle of stones, which was used to predict astronomical events.

Population: 1.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A college in rural Kansas founded to prepare the country for an impending World War III.

A diverse, expansive nature preserve in northeastern Kansas.

Cannon designed to fire an atomic warhead.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Even with its slightly risible name this colossal cross is still able to inspire awe.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

An abandoned observatory in the middle of the Illinois prairie.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

This family driveway also serves as the highest point in Illinois.

The only place in America where anyone who wants can shovel coal aboard an antique train.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An enormous, inside-out glass globe built in 1935.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.