Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

The land is home to swimming ponies and a legendary 18th-century treasure.

Moonbows over Kentucky.

The world's longest known cave system.

A statue honoring 44 continuous years of greeting passing ships.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Ruins of a Carnegie family mansion on Cumberland Island.

"We Seceded Where Others Failed."

The highway's southernmost spot is a beloved local attraction.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

This now-deactivated naval base defended the Florida coast for centuries.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A building so large that it has its own weather.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

A monument celebrating the idea of reaching inaccessible places.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The only Florida state park with publicly accessible caves.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .