A stretch of highway even lonelier than the so-called "Loneliest Road in America."

These markers are used to document elevation changes around the famed dam.

Improbably, the largest wildlife refuge in the conterminous 48 states sits just northwest of Las Vegas, Nevada.

These markers are used to determine the ground stability of the Strip.

This ancient village provides insight into the complexity of the pre-Columbian Fremont Culture.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Experience a charming 1930's version of "infotainment."

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

The longest living non-clonal organisms on Earth.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Around 50 million gallons of water flow from this spring every day.

A historic, scenic mill that was forced to close due to overlogging.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

Often referred to as the largest spring in America.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant granite rocks standing end-to-end like a train of circus elephants.

Journey up the capitol building's cupola for an amazing view of Topeka.