The museum is 12 acres, and the village is 93 acres. It is officially the Edison National Historical Site and run by the National Park Service. The factory is gone, but there is a sizable two-story brick building, the lab, and several smaller buildings. The whole facility has been preserved since Edison's death in the 1930s. The lab contains a large machine shop, still set up as it would have been back then.
Access is only by tour.
The precision shop is off limits. The level of detail is geared to the interest of the general public, and don't confuse the schoolchildren. It's at Main Street and Lakeside Avenue, in West Orange. The Torrington Historical Society has put together a display of lineshaft driven machinery made in Torrington by the Hendey Machine Company. All machines have been restored, actually run and are capable of making parts.