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

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

A largely forgotten and touching neoclassical marble fountain overlooking a bear mound effigy.

Where experiments are conducted on all things wood.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

The arboretum whose marshy soil sucked up the dreams of housing developers.