This rustic old building is said to be the most photographed barn in America.

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.

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

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

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

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Limestone caves with spectacular showcase chambers.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

Get up close to emus and ostriches, or buy their tasty meat.

A massive volcanic plug is now a protected area that hosts a number of bird species.

An alley covered with 20 years of bubble gum.