As an adult, what seemingly childish things do you get excited about?
I love bridges. If I see a cool looking bridge, I want to cross it, especially if it goes somewhere that I'm not familiar with. Same with stairs outdoors. They feel like an adventure to me.
Trains, and sirens. Their history, the way they work and are put together, the rare units, all really fascinating to me. There's so much obscure information that is just waiting to be uncovered.