For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

A small wall and marker are all that remain of this historic canal tunnel.

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

A castle built by an eccentric medieval enthusiast in suburban Ohio.

How did a massive marine arthropod find its way to landlocked Ohio?

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

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

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

One of the few surviving examples of the first lock and dam system built on the Ohio River.

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.