A historic gristmill that still produces flour and grits the old-fashioned way.

These eerie outliers of the lightning bug family glow a mysterious blue color.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

The world's longest known cave system.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The former home of the 11th president of the United States.

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

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

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

The alley connecting two of country music’s most historic venues has a rich history of its own.