Half of a waterfall goes into the river while the other half seems to disappear.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A unique botanical garden housed in three giant geodesic domes.

Spectacular views await visitors to this lake.

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

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

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

The final resting place of the living embodiment of the famous Forest Service symbol.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Legends surround this jagged rock formation in the New Mexico desert.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.