The largest ancient burial mound in Ohio.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

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

In this relatively flat state the highest point is an honored place.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

A gregarious Ohio resident has been building his whimsical temple to peace for decades.

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

The final resting place of the most famous sharpshooter.

One of the largest collections of holy relics in the country.

A county library in rural Ohio houses one of the finest mineral collections in the world.

The oldest county library in the United States.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

From this desk Al Hirschfeld drew his influential caricatures of the 20th century's Broadway stars.

Wine bottle sculpture with a ship's stateroom inside.

This diesel train serviced the Brooklyn waterfront for more than three decades.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

After surviving abandonment, this powerful Latin American mural is alive again.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

An artist's cute bronze subway sculptures belie his violent artistic past.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.