Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The seat of Buffalo government is a gorgeous Art Deco palace.

This abandoned factory on the Hudson River once churned out a million bricks a week.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.