Fishkill, New York is halfway between Ossining & Rhinebeck
187 miles on NY-17
About 3.5 - 4 hours
From Manhattan (which I just chose for a standard NYC location) to Rhinebeck, NY is about 115 miles. Driving it takes about 2 hours, 15 minutes or you can take either Amtrack (from Penn station) or the MTA train (from Grand Central Terminal) to Kingston, NY. From Kingston, Rhinebeck is only 12 miles.
It is 278.39 miles according to MapQuest.
And
If that's Rhinebeck, the distance is 60 miles.
It is 56.3 miles according to Google Maps.
The address of the Museum Of Rhinebeck History is: 7015 Route 9, Rhinebeck, NY 12572
They are right across the Hudson River from each other. To cross the river, take the KINGSTON-RHINECLIFF BRIDGE on NY-199.
The address of the Fishkill Historical Society is: Po Box 133, Fishkill, NY 12524-0133
The address of the Blodgett Memorial Library District Of Fishkill is: 37 Broad Street, Fishkill, 12524 1836