Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

What was once the largest NFL stadium.

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

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

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

These sprawling mines once served as a source of plaster and today serve as a storage facility.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Dozens of padlock-trees along the Moscow River.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Former headquarters of the KGB.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The only road through the heart of Glacier National Park.

An architect's childhood fantasy treehouse made real.

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

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

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Dramatic river bend surrounds a natural red-rocked pedestal.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This historic national park is covered in the stunning ruins of red rock pueblos.

A museum devoted entirely to the rattlesnakes and snake-related art.