Abandoned tree houses don’t disappear when kids grow up. Many still exist, not far from residential areas, left as artifacts of youth. Dr. Martin Rundkvist, an archaeologist who writes the blog Aardvarchaeology (part of the ScienceBlogs network) ruminates on the “ruins of childhood” that can be found simply by walking through the woods near people’s homes. Originally posted in 2006, his recent re-post was prompted by another abandoned tree house discovery. In a beautiful blend of science and nostalgia, Rundkvist writes about how the relics now live on as modern-day archaeological discoveries.