The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The highest bridge in America was built for an almost unnervingly small amount of money.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

When ecosystems collide in the arid Southwest.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A man-made island in scenic San Francisco Bay.

The "lovely red Vega" of the legendary record-settling pilot.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

An abandoned coal mine reached by a steep hike.

A devilishly named gorge that was a sign of salvation for many pioneers.

The exterior of this home was used for the hit television show, The Brady Bunch.

Home to over 300 antique cars and motorcycles, including Thomas Edison's Model A.

The first KFC is on the National Register of Historic Places.

A memorial dedicated to the victims of the Columbine High School shootings.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

This abandoned nuclear cooling tower casts a shadow over a bucolic town.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This freshwater spring fills with 10,000 gallons of water per minute.