Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

One of the smallest towns in the United States.

Mysterious meeting place for UFO hunters near Area 51.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

A mysterious inscription may hold a clue about the "Lost Colony" of Roanoke.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

This shallow cave got its name from copious amount of human bones found inside.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

The largest ancient burial mound in Ohio.

Ancient human, animal, and geometric figures drawn in the earth.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

This feline raises a friendly paw at drivers barreling toward the freeway.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

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

Two rocks in a perpetual kiss and one of "the most romantic spot in America."