This free, take-a-book shop seems like a trick but isn't.

Explore 10 acres of environmental sculptures.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

A castle built by an eccentric medieval enthusiast in rural Ohio.

The beauty of urban decay, hiding some dark secrets.

When ecosystems collide in the arid Southwest.

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

New Orleans' famous cemetery, located on the site of a former race track.

Historic funicular railway, believed to be the shortest railroad in the world.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

An essential stop before plundering, BYO Cutlass.

An extraordinary mixture of natural beauty and man-made phenomena.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

The eccentric mansion of one the most popular horror authors of modern times.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

"Looks so real, it's scary!"

An antiquated German apothecary on Chicago's North Side.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.