Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

A small wall and marker are all that remain of this historic canal tunnel.

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

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

148 feet long and in the middle of a verdant forest.

This tomb was fashioned with a sliding window for a grieving mother who struggled with her daughter's death.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

This church houses the “incorrupt” body of its founding Bishop.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

Origin of the blue-skinned Fugates of eastern Kentucky.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

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

Ornate limestone building now filled with geologic specimens, and more.

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

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

An oversized metal construction of Billy Tripp's moods going through life.

If astronomy had a ghost, it would look like this observatory.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

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

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.