A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A quirky collection of outsider art made from automobile parts.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

These lush botanical gardens employ the most purrfect pest control force.

A glittering Thai Buddhist temple in suburban Pennsylvania.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

The abandoned coal loading dock is a canvas for unsanctioned art.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

This elaborate towering structure was once famed for its revolutionary height.

A failed piece of Orientalism has become the proud symbol of a community.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

The graffitied ruins stand hidden within the Pennsylvania woods.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The world's largest Our Lady of Guadalupe statue overlooks this Ohio sanctuary.