00:00Think you know America? Think again. These unsolved mysteries will make you look twice.
00:05Number 5. The Taos Hum. Some New Mexicans hear a low persistent drone with no source.
00:11Number 4. The Zodiac Killer. Encrypted letters were mailed to newspapers and police.
00:17He taunted police with ciphers and chilling messages. The case was never fully cracked.
00:22Number 3. The Disappearance of the Roanoke Colony. An entire settlement vanished without
00:28explanation. One cryptic word was carved into a post. Number 2. The Springfield 3. A Dyatlov-like
00:36mystery. Three women gone without a trace. And number 1. Area 51. Secret tests are rumored at
00:43remote facilities. Strange sightings and UFO lore surround the base. A conspiracy machine around
00:49it won't quit. Which one creeps you out the most? Drop your theory below.
