Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

In an effort to escape the horrors of slavery, one man mailed himself to freedom.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

This collection of neon icons is preserving Arizona's history, one sign at a time.

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

One of America's oldest stadiums was also the site of one of the most brutal anti-labor acts in American history.

Collection of vintage trailers double as hotel rooms.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

A mistaken marker makes an erroneous claim along the historic Old Divide Road.

America's only nuclear missile silo open to the public.