An enormous natural sandstone bridge in Kentucky.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This 100-foot tall bluff located in the western plains of Kansas overlooks a massive reservoir.

The only museum in the world dedicated to the history of sprint car racing, next to one of the country's most historic dirt tracks.

A small burial plot formerly stranded in the middle of a road.

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

These abandoned grain silos and tunnels are an urban exploration dream.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

This pop-culture shop also offers the chance to become part of their favorite tv show or movie.

It was once used as a classroom to teach mining skills to local high school students.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This "living building" on Georgia Tech's campus is home to a blueberry orchard, honeybees, and more than 900 solar panels.

Giant instrument-shaped home in Fayetteville, Georgia.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

This creative sculpture was a way to "recycle" an old tree.

The graves in Florida's oldest Black cemeteries are marked with shells, stones, and mementos of the deceased.

Hidden in the plaza next to a pizza shop is an amazing little oddities shop.