You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This historic train station has been converted to a locomotive themed hotel.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

More than five miles of underground passageways.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The world's longest known cave system.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

The first full-scale tunnel built in America is short but scenic.

The small cave that housed Tennessee's "first citizen."

This replica of the Greek structure is in the heart of Nashville.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.