Patterns in UFO and UAP sightings across the world. A strange formation is seen in the sky over the sleepy suburbs of Tinley Park, Illinois. The lights return for a second time almost to the date the following year.

A sacred place for centuries, the Arizona city of Sedona is known for its unusual occurrences. With all the activity that's been recorded here, it seems the red desert could double as an intergalactic airport. This programme considers what might be drawing UFOs to this spot.