A beach made of semi-precious green sand on the Big Island of Hawai'i.

This black shoreline is made up of exploded lava particles.

The drama of nature in full effect in this Nevada State Park.

The longest living non-clonal organisms on Earth.

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

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

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The largest source of fossilized insects anywhere.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Decades before the scandal, this staircase on the river was a literal "water gate."

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Elvis's own personal tropical hideaway.

St. Augustine's record-setting narrow street was designed to protect against pirates.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Georgia's first brewery is also one of its oldest surviving buildings.

A massive sea stack famous for its appearance in The Goonies.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

The longest continuous lava tube in Oregon.