9. Czech Catacombs
Legend says that the sound of an organ came from the Czech catacombs. In 1996, scientists recorded them. The tunnel was 30 feet deep and there wasn't a single room that could fit an instrument of that size around. Psychologists also examined eyewitnesses present to rule out the popular hallucinogenic theory. However, the main phenomenon found is "Shining corridor". Specimens showed no phosphorus in them. At first glance, this corridor was quite ordinary, but soon it began to emit a red-orange light.