Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

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

More than five miles of underground passageways.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

The pan man stands as a testament to the functionality of American cast iron cookware.

All that's left of the quintessential "cabin in the woods."

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

This Tennessee manse was built so opulent that the very utilities doomed it to fail.

This structure among the trees was the result of divine inspiration.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

Dinosaurs invade a suburban Nashville neighborhood.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

It may take some time to locate, but it's sure to warm even a heart of stone.

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.

A delightful park featuring homemade scale replicas of dinosaurs, tucked away in the Tennessee mountains.

The first full-scale tunnel built in America is short but scenic.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Walk the whole Mississippi River!

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Mile-long cave system near Great Smoky Mountains.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Enormous lake at the bottom of a unique cave system.

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