This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

The world's longest known cave system.

This building contains handprints that are well over a century old.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

A steeple in the shape of a golden hand pointing straight up commemorates Zebulun Butler, the first full-time pastor of this Mississippi church.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

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

A monument celebrating the idea of reaching inaccessible places.

One of the oldest living oak trees in the Southeast.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

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

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

So many migrating birds roost on the bridge, it has a special summer speed limit.

The maritime museum that boasts the largest nautical library in the western hemisphere.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.