This weekend is Open House New York. You can go into those bell towers and basements you've frequently walked by, but never entered. There's going to be lots of gardens and urban nature to explore, like The High Line, the elevated rail viaduct in West Chelsea, the New York Restoration Project - The Peter Jay Sharp Boathouse at Swindler Cove Park on the Harlem River, Wave Hill Gardens in Riverdale and several historic cemeteries. Visit Open House New York for details.