Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

A decaying concrete oil tanker served as a disposal location for bootleg hootch.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

A serene temple with stunning stained glass hides in downtown Dallas.

Three hundred years of preserved Spanish colonial history in San Antonio.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

This mostly abandoned shopping outlet is now adorned with beautiful graffiti and murals.

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

Experience a charming 1930s version of "infotainment."

Boise State's stadium was the first non-green football field in the world.

The largest outdoor art gallery in the Northwest United States.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

This spectacular track has run continuously since 1882.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

The world’s largest concentrated solar plant generates as many problems as megawatts.

This giant temperature attraction created some giant electric bills.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Miraculous tree that seems to sprout out of solid rock.