These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

The fifth-longest natural arch in the world, and the longest outside China.

An architect's childhood fantasy treehouse made real.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

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

The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

Exact replica of the ancient monument, but much, much lighter.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.

The scene of the largest surrender of Confederate troops at the end of the American Civil War.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

North Carolina's only restored fort from the French and Indian War.

A forgotten sea village stands silent after hurricanes deemed it obsolete.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.