Elevated freight railway turned wildly successful urban park.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

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

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.