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

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

A whopping 14,000 copper coins cover this miniature fighter jet.

This museum sits on the site of a decommissioned military communications base.

At 207 feet, one of the world's longest continuous escalators.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The skeletal white beams stand as a monument to religious dissent.

This fairytale-like structure is the last turf church ever constructed in Iceland.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A place to pay homage to Taíno heritage.

A resilient tree that has survived for more than 700 years in Guánica Dry Forest.

An unnatural lake in a naturally beautiful setting.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

This poor little statue is the most vandalized memorial in Washington.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A derelict bit of transportation infrastructure hidden in the woods.

A traditional village rooted in the Joseon Dynasty.

All that remains of an ancient royal palace is a water channel that was used for drinking games.

The name of the only golden Buddhist temple in Korea translates as "the temple that protects the country."

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

One man's lifetime collection of tiny objects of wisdom gathered from around the world, on display for public enjoyment.