Going back to your childhood home

I'm going to be visiting my hometown in a few months. It's been a very long time (10+ years) since I've been back, and I haven't seen my childhood home since my parents sold it in 2000. Based on Google streetview, it's still standing but somebody else lives there now.

Would it be weird to stop by, knock on the door, and ask to look around? I know this happens on TV, but the real thing would probably make someone uncomfortable. Maybe send a letter beforehand? I dunno. What do y'all think?