Hard to say, like a lot on here, I was a nosey kid. I was lucky enough to move into a very big manor houses at 13 years. It had old wine cellars, and push buttons in bedrooms for maids, and an old call box in a downstairs kitchen for them to attend which ever toom was calling. I was curious and asked all sorts of questions back then. I also lived in an old village, littered with big old houses, an abbey and loads of tunnels. I never really appreciated it back then though.
Around 2004 a friend invited me to have a nose at an old mansion in Essex. Valentines mansion, a 1600 year old place, before it got refurbed. After that I discovered its history and I was hooked.