Rare recess caves fill this unbelievably beautiful Ohio park.

This former tuberculosis treatment facility now stands at the center of a public park.

An abandoned munitions factory with a shot tower continues to wage war on the surrounding environment.

The only 'battle' in the Toledo War between Michigan and Ohio set the stage for a persistent state rivalry.

A focal point for the German American Festival-Society symbolizing the "Spirit of Unity' and fellowship for the Toledo area.

The childhood home of the Wright Brothers in Dayton.

The playful side of the Columbus community is on full display.

This former factory has deep ties to rubber production in Akron.

A former nuclear facility during the Cold War turned nature preserve.

This unique piece of land is home to a patented artificial lake and the remains of an old Girl Scout camp.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

This underground holding cell was forgotten for over a century and rediscovered in the 1960s.

One of the few beardless depictions of Lincoln, George Grey Barnard's 1917 was denounced by many—including Lincoln's own son.

A former Canadian automobile ferry mysteriously appeared in the Black River 20 years ago, and now it quietly rusts away.

A moving tribute to a leader of the American abolitionist movement.

The final resting place of one of the most iconic musicians of the '80s.

Built around 1845, this house was occupied for 100 years, serving as a home to a prosecuting attorney, a Union Civil War general, and a wealthy socialite.

Smoky, also known as "Yorkie Doodle Dandy," was a four-pound hero of World War II.

The mounds at this site were reconstructed with the help of archaeologists and historians.

This campus museum commemorates a national tragedy.

In the middle of an abandoned stretch of old Route 50 lies a tombstone that weighs three tons.

After covering almost 1.5 billion acres, the survey's still not finished.

Historical structures and natural wonders await visitors to this preserve.

The nearly 200-year-old building displays a perplexing grammatical error.