An off-the-beaten path cave with an underground lake.

A dazzling display of lights and crystals.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

One of the world’s most powerful corporations was established on a random Albuquerque street corner.

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

The first "Hut" was actually a small brick building.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

The final resting place of the great navigator, or maybe his brother.

Two small markers remember the Alamo's feline protectors.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

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

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

These boots are made for selfies.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.