For decades, this waterfall remained hidden because of an artificial dam.

See the nearly two-century-old ruins of pre-railroad America at the former site of a lock on the Ohio and Erie Canal.

The site of the worst mining disaster in Ohio's history.

A monument to the “unrecognized dead” of the tragic 1876 train crash.

The failure of one component toppled this entire bridge during rush hour.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

A rare particle accelerator with a tremendous energy range is tucked away at Ohio University.

In northern Ohio, the glorious past of America's trains is on full display.

A lost cemetery stands forgotten on a hilltop, known only to the older residents of Pomeroy.

One of the few places where you can explore a 1918 paddlewheel steamboat from stem to stern.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

One of the last few period-correct, hand-operated canal locks in the country.

All that remains of a gigantic earth-moving machine.

This schoolhouse for Black American children is one of the oldest remaining in southeastern Ohio.

The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

This tower-tomb honors a president who only held office for a little over a month but dedicated his life to his country.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

This retired stagecoach tavern is the oldest building in Cleveland.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

The spectacular collection of one of the world's best woodcarvers.