This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

A giant ball made from pieces of an old Jeep.

Within this beautiful Pittsburgh cemetery, a unique headstone bears witness to one man's eternal love for Jaws.

This public space is speckled with the eerie remnants of a defunct amusement park.

The graffitied ruins stand hidden within the Pennsylvania woods.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

This moving cemetery sphere is a slowly rolling stone.

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

This shop filled with oddities and knick-knacks is named for a 19th-century charlatan.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

A beautiful oddities shop crammed with strange and morbid curiosities.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

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

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Visit this playground of waterfalls, caves and sinkholes.

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