There are about 30,000 square miles of glaciers in Alaska, many of which have been melting rapidly. The largest, the Bering glacier, deposits 6.5 trillion gallons of water a year into the Gulf of Alaska

From the Smithsonian's Rock and Soul Museum, to the Stax Museum of American Soul, to the National Civil Rights Museum, Memphis is a city rich in music, art, culture.

There are 50 active volcanoes in Alaska, two of which blow their tops every year. But nothing compares to the 15 cubic kilometers of magma that spewed from this volcano in 1912.

Every windmill in this huge windfarm will need to be put together piece by piece in a delicate procedure that takes the power of a machine and the precision of human hand.

Every year on the anniversary of the most horrifying act of domestic terrorism in America, people gather to remember the Oklahoma City Bombing at a memorial built on the site of the attack.

Colorado's Maroon Bells are some of the most photographed mountain peaks in the world, but climbers know that they're also unbelievably dangerous.

Settled by Puritans in the 1630s, Boston has grown from a humble city on a hill to a modern metropolis.

The crumbling foundations of the remains of the Branch Davidian compound tell the story of a few fateful weeks in North Texas in 1993.

Despite its dry desert landscapes, Utah is a land of endless surprises, and Glen Canyon is one of them, rivaling Arizona's Grand Canyon for sheer majesty.

Charles Lindberg's dreams of flight took off at a young age, when an airplane flying over Little Falls, Minnesota captured his imagination.