If you pay attention to my profile it's obvious that I'm all about my kids. I try to share my interests with them and recently have been trying to get them into architecture any way possible.
There's a surprising amount of good resources on architecture for children. Many people think they like architecture but are more into interior design rather than the technical and mathematics aspects of architecture. I used to be this way as well until I took the extra effort to understand the foundation of these concepts.
I've found a lot of great books to give my children about architectural terms and also model building games that they really have come to love. It's like a more sophisticated Lego set.
My daughter in particular really loves the architectural things because she's so passionate about math. It's her favorite subject in school & this gives her ways to practice her skill.