A tragedy and memorial that raised awareness about the dangers of unsealed mineshafts.

One of the few Cold War-era bases with many of its original structures still standing.

The longest structure of its kind ever built in Michigan.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

The statues honor the state transportation employees who've died while performing their work-related duties.

This solemn facility remembers the cruel effort to compel Native American children to relinquish their culture.

Constructed from the ruins of a former glass factory, this park incorporates the old with the new.

The final resting place of the world's first nuclear reactor.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

A century-old network of freight tunnels underneath the city's historic business district.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

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

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

An unknown number of cholera victims are buried in two nondescript graves.

This magnificent Cincinnati graveyard is also a popular public park.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

A small town museum celebrates the history of the Ohio county that produced Annie Oakley and other famous figures.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

A larger-than-life version of the hat beloved by hunters, outdoorsmen, and Holden Caulfield.

The honor of highest point in Michigan was almost given to the wrong peak before this mountain won out by 11 inches.

Largest outdoor staircase in the United States.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

Egyptian Revival obelisks still rise over the old mine shafts.

World's largest pet casket company brings in up to $5 million per year in revenue.