The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

A 30-foot stack of piano keys memorializes one of the greatest keys players in jazz history.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

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

This restaurant proudly displays bread signed by the 39th president.

This steamer is known as "The ship that built Cleveland."

This unique collection collects pieces of art etched into thin pieces of stone.

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

A headstone tells the sad story of a lost little boy and his pet dog.

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

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

The largest ancient burial mound in Ohio.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Deep scars on the earth left by the Ice Age.

A history of tragedy and a pile of eerie stories have contributed to this house's consistent ranking as one of the most haunted places in Ohio.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

What remains of the summer palace of King Kamehameha III.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.