In Danbury, Conn., a crowd observes a triangular craft in the air. It was part of a wave of sightings in the Hudson Valley, where more than 5000 similar events were reported between 1983 and 1986.

An Australian ranch hand races to protect his herd from a nearby object that is hovering directly over his water tower.

A biochemist watches a mysterious craft land in his yard, presenting an opportunity to scientifically examine the unexpected item.

A farmer out for a regular drive in broad daylight sees something completely out of the ordinary: a 30-foot-wide flying saucer.

On a sales trip in rural Australia, one man witnesses a strange light in a field. His car spins out of control, which is when things get even stranger.

A strange, flying object is outside an East Germany apartment complex... and then the light moves to the window.

When a police officer investigates an explosion in the desert, he sees what appears to be two small men in black. Can he trust his eyes?

It's 1975 at Loring Air Force Base, the largest strategic Air Force base in America - and a repository for nuclear weapons. Military officers at the base witness something unexplained.

Just after World War II, as the Cold War rolls on, one Swedish farmer sees what can only be described as a ghost rocket.

Dozens of people witness a strange object fall into the water and become submerged in Shag Harbour, Canada.

American soldiers stationed in England encounter unexplained lights in the forest and are given 'shoot on sight' orders.

A mysterious object stops right over John Hudson's car in the foothill of the Catskill Mountains.

A police officer spots a strange light in the sky in Minnesota. Things only get stranger after he crashes right into it... or it crashes into him.

The Hale - Bopp comet was overhead but a strange formation of lights in the sky didn't appear to be natural.

Reports of a downed aircraft bring a volunteer firefighter to a remote wooded area.

A Japan Air Lines pilot spots a mysterious object on his radar and sees bright lights outside the window of his aircraft.

The Hale - Bopp comet was overhead but a strange formation of lights in the sky didn't appear to be natural.

A Japan Air Lines pilot spots a mysterious object on his radar and sees bright lights outside the window of his aircraft.

A police officer spots a strange light in the sky in Minnesota. Things only get stranger after he crashes right into it... or it crashes into him.

A mysterious object stops right over John Hudson's car in the foothill of the Catskill Mountains.

First one police officer spots a flying object that seems to change shape as it travels - and then more officers see it.

A strange object hovering in the field of a Kansas farm leaves behind a glowing ring in the soil.

Dozens of people witness a strange object fall into the water and become submerged in Shag Harbour, Canada.

American soldiers stationed in England encounter unexplained lights in the forest and are given 'shoot on sight' orders.

It's 1975 at Loring Air Force Base, the largest strategic Air Force base in America - and a repository for nuclear weapons. Military officers at the base witness something unexplained.

Just after World War II, as the Cold War rolls on, one Swedish farmer sees what can only be described as a ghost rocket.

A farmer out for a regular drive in broad daylight sees something completely out of the ordinary: a 30-foot-wide flying saucer.

On a sales trip in rural Australia, one man witnesses a strange light in a field. His car spins out of control, which is when things get even stranger.

A strange, flying object is outside an East Germany apartment complex... and then the light moves to the window.

When a police officer investigates an explosion in the desert, he sees what appears to be two small men in black. Can he trust his eyes?

An Australian ranch hand races to protect his herd from a nearby object that is hovering directly over his water tower.

A biochemist watches a mysterious craft land in his yard, presenting an opportunity to scientifically examine the unexpected item.