UFO sightings in Shag Harbour, Nova Scotia, in 1967.

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Examining the supposed 1897 crash of a UFO in Aurora, Texas. According to lore, the craft crashed into a windmill, and its alien pilot was buried in a local cemetery.

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The aftermath of the 1947 Roswell UFO incident is recalled. Based on the book "The Day After Roswell," by William J. Birnes and Lt. Col. Philip J. Corso (USA Ret.), who comments.

Studies some of the most disturbing UFO sightings, including: a 4-day extravaganza in 1952, when UFOs cruised the skies over the White House; sightings in 1967 near a secret US/Canadian submarine detection base; controversial events at the UK/US air base at Bentwaters, England; and the military's Test Area 51 in Nevada. Recounts the recorded UFO encounters that have taken place near test ranges, air bases and nuclear power plants. Included: a widely reported July 1952 sighting over Washington, D.C. Also: the secret world of Area 51.

For those who study the UFO phenomenon, "UFO Hot Spots" are places around the globe known for a long history of UFO sightings and reports. From Brazil to Mexico, from Washington State to Florida, multiple witnesses, including air traffic controllers and even military personnel, confirm that something unexplained is repeatedly happening in the night sky. Tales of alien abductions, bizarre and chilling photographs of UFOs, and hours of videotape all abound as we search for UFO Hot Spots.

It's all hush-hush as we track a secretive global paper trail, delving into government plans on how to deal with other-planet visitors. Searching historical records, we find that protocols are in place--from the U.S. military's JANAP-146 reporting requirements to France's Cometa files, from Chapter 13 of the FEMA Fire Officer's Guide to Disaster Control titled "Enemy Attack and UFO Potential", to a now-repealed federal law titled "Extraterrestrial Exposure".

Researchers reinterpret religious documents to find evidence of ancient UFO activity.

Investigation into the 1991 mass UFO sighting over Mexico City during a solar eclipse and other sightings as possible examples of alien contact with the inhabitants of planet Earth.

The puzzling formations known as crop circles have appeared worldwide throughout history. In the Middle Ages, they were called "witch" or "pixie" circles, and a 1678 woodcut, the "Mowing Devil", depicts one thought to be Satan's work. But in the 1980s, the phenomenon escalated, with dozens of crop circles popping up in England and other countries. When two Englishmen claimed they had perpetrated the hoax, many felt the riddle was solved. And yet, more have materialized. We explore the mystery.

Area 51 becomes a symbol of secrecy within the U.S. military-intelligence system.

A review of what some say is evidence of UFO encounters through mankind's history – from prehistoric cave paintings, to Medieval frescoes, to Renaissance art that depict strange objects in the sky.

In an investigation of some of the most puzzling UFO sightings in Soviet history, we uncover the work of an underground network of believers and reveal a clandestine 13-year government investigation of UFOs. Many Russian UFO enthusiasts believe that proof of alien encounters exists--but it's being hidden from them! We also meet George Knapp, an American broadcast journalist who traveled to Russia in the early 1990s and believes there's a treasure trove of KGB UFO files that remain top-secret.

Studies some of the most disturbing UFO sightings, including: a 4-day extravaganza in 1952, when UFOs cruised the skies over the White House; sightings in 1967 near a secret US/Canadian submarine detection base; controversial events at the UK/US air base at Bentwaters, England; and the military's Test Area 51 in Nevada. Recounts the recorded UFO encounters that have taken place near test ranges, air bases and nuclear power plants. Included: a widely reported July 1952 sighting over Washington, D.C. Also: the secret world of Area 51.