I looked through the guidebook I stole from my parent's massive guide book library the night before we left, and found Hever Castle. I sold it to Richard and he figured out which trains to take and when. (Each day we get a little better at this.)
The journey altogether took almost two hours, but that's partly because we missed our train and took a lunch break in East Croydon.
When we got off at the station it was hard to imagine there was anything worth seeing nearby. It was soooo quiet. The station felt like it was in the middle of nowhere. So we walked the back roads to the village and found the castle.