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

This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

Home to several unusual artifacts, including a huge painting of George Washington.

A memorial honoring those who perished in one of the worst construction disasters in U.S. history.

This outdoor exhibit features a historic wooden dam once used to help boats navigate the Ohio River.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

A larger than life statue of a steelworker keeps watch over a closed steel mill.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

This California artist's front yard acts as a gallery for his unique, scrap metal animal sculptures.

A storybook church made from a mesmerizing medley of multi-colored stones.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.

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

One of the oldest surviving lock houses on the Ohio River.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

A sycamore tree grown from seeds that traveled to the moon.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

It would take 35 firetrucks to fill this enormous glacial pothole.

Oldest existing wire suspension bridge in the United States.

A winding, cliffside stretch of road overlooking the Delaware River.