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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A beautiful geyser under environmental threat.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Inside this library, the history of Los Angeles is retold through a mural.

Although he donated over 3,000 acres to Los Angles, Griffith's life was marred by controversy.

A historic fort commemorating the United States' naval history.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

Historic funicular railway, believed to be the shortest railroad in the world.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

America's most famous piece of self-built architecture.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

This huge clock made of flowers and simple machinery was once used a political weapon.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.