A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

The world's largest military aircraft cemetery.

Once a staging site for World War II munitions.

A tribute to the little-known group of women who were the first ever to fly aircraft in the U.S. military.

Search for traces of the dinosaurs that roamed here more than 90 million years ago.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

There is an unmarked red button hidden over Houston's Buffalo Bayou that is just begging to pushed...

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

World War II bunker still standing on the New Jersey beach.

This Cold War siren is one off the last of its kind still standing with its immensely powerful original horn.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.