Growing up in Hawaii, I remember playing in an overgrown backyard at a friend's house and discovering, much to my amazement, a cave tucked away among the weeds on the hillside. In it, we found helmets, canteens, discarded papers - war-time relics from decades ago - and I was spellbound to be in the presence of objects that seemed to belong to ghosts. This round-up of abandoned locations around the world reminds me of that moment.
See more - and find original sources - at My Science Academy, here. Happy Monday!