A "grange" is a sort of farm or estate (after "barn") and this is Alexander Hamilton's Harlem residence. It borders St. Nicholas Park, which is nice in itself with nice views and paths. Free of charge, there is the museum area and a tour of the upstairs residence (a deputy guide was a tad rude in her style). Nearby is the Hamilton Grange NYPL branch. Couple local churches are architecturally impressive. Grant's Tomb is around a mile away. Nice day trip.