This massive estate is one of the most renowned in the US. It's simply breathtaking in its beauty and its size. There's a handful of different tours, and honestly, since the Grand Tour is only three hours, I'd suggest that one. Even in three hours you feel like you were kinda rushed through the place (the tour guides - mostly older ladies - can be a little impatient). I personally loved the history. There's lots of info on the Rockefeller family and how John became the US's first billionaire.