The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

This mill has survived a tumultuous past to still produce flour and cornmeal.

These markers are used to document elevation changes around the famed dam.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Experience a charming 1930's version of "infotainment."

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

One person's lost luggage is another person's treasure.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

Built by prisoners of war, the largest small-scale model ever built includes eight miles of tiny streams that now sit abandoned.

An old-timey wax exhibition campily depicting New Orleans legends and scandals.

The only cave in Louisiana has played host to a state's-worth of clandestine activities.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

A museum dedicated to the lovable crime couple Bonnie & Clyde, just a few miles away from the site of their early demise.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

The final resting place of New Orleans' most famous voodoo priestess.

The first Protestant church in Arizona and only Gothic Revival style adobe church in the world.

This church on a Tohono O'Odham reservation has stood since 1797.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The world's largest military aircraft cemetery.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A self-built castle made by a mysterious man.