On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Limestone caves with spectacular showcase chambers.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

See massive fossils that are over 200 million years old in northeastern Arizona.

One person’s lost luggage is another person’s treasure.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

A fitting attraction for the corn capital of the world.

Just a man taking his prehistoric pet for a stroll.

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

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

This erect, phallic geological spire wasn't always named so domestically.

From this scenic rockface, you can still see the paths Western pioneers followed.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

Home to Hollywood history and a very special salt crystal.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This nearly abandoned town was once a thriving mining community until a series of fires.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

Abandoned silver mine strewn with wrecked and twisted structures.