La Mancha Negra (The Black Stain) is a mysterious black substance that has oozed from roads in Caracas, Venezuela, first appearing in 1986. Since the appearance of La Mancha Negra, it has caused multiple car accidents and claimed many lives. After nearly two decades of study and millions of dollars spent to identify the substance and its source, finding the cause has proven difficult and there are still no definitive explanations.
In 1986, La Mancha Negra first appeared as a smudge 50 yards long...
