It is a pretty interesting bit of knowledge that Madison County has three sites that are recognized as part of the National Parks System.  The Chittenango Landing Canal Boat Museum and the Canastota Canal Town Museum can be found on the NPS passport to the parks program for the Erie Canalway National Heritage Corridor.  The other site is the Gerrit Smith Estate National Historic Landmark in Peterboro.
The Gerrit Smith Estate was designated a National Historic Landmark in January of 2001.  This designation made it the first National Parks site in Madison County, and recognized the impact Smith and his family had on the abolition movement and the Underground Railroad.
The Estate is a National Park Service Network to Freedom Underground Railroad site, a Heritage NY Underground Railroad site, and also a Madison County NY Freedom Trail site.
Over the past 11 years a group of very dedicated volunteers has worked to increase the visitor amenities at the site, and this past summer multiple interpretive signs were installed on the Estate grounds, telling the story of Smith and his works to free blacks in the 1800's. 
The Estate should be a must see stop for any visitor coming to Madison County, as it really shows the impact this part of the state had on shaping world events 150 years ago. 
The Visitor Center and Estate buildings are open every Saturday and Sunday from 1-5 PM. Admission is $3/Adults, Free for Students and Stewards.  The grounds remain open for self guided tours from dawn to dusk every day.