Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

The largest ancient burial mound in Ohio.

Moscow's imposing monument to the Space Age.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A historic dam made famous for its turbines and feature in a Hollywood classic.

Every week, a festive public jam session breaks out in downtown Asheville.

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

This improbable contraption was passed down through five generations of industrious Tennesseans.

An abandoned town is hidden in Great Smoky Mountains National Park.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

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

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

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

The second oldest continuously operating bar in Louisiana.

A snapshot of the city's fascinating voodoo culture.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

The largest earthwork effigy in the world.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Inside, ancient treasures. Outside, modern contradictions.

Gargantuan home of Russian science.