"Every generation has its conspiracy theories."

"Some begin with genuine mysteries."

"Others begin with misunderstanding."

"And some..."

"Are deliberately created."

"In the digital age..."

"A rumor can travel around the world before anyone has time to examine the evidence."

"Tonight..."

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"Every night..."

"It watches us."

"Silent..."

"Unmoving..."

"Faithfully circling our planet for billions of years."

"The Moon has inspired poetry..."

"Religion..."

"Science..."

"And..."

"Conspiracy."

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"The farther north you travel..."

"The fewer people you meet."

"The quieter the skies become."

"But silence..."

"Doesn't always mean nothing is there."

"For decades..."

"Pilots..."

"Hunters..."

"RCMP officers..."

"Military personnel..."

"And Indigenous communities..."

"Have reported strange lights moving across the northern skies."

"Some disappear without a trace."

"Some perform maneuvers beyond what witnesses expected from conventional aircraft."

"Most are eventually explained."

"Some remain unidentified."

"Tonight..."

"We journey into one of the most isolated regions on Earth..."

"On the morning of September 11th..."

"The world watched New York."

"But nearly four hundred kilometers to the south..."

"Another attack was unfolding."

"At 9:37 a.m..."

"American Airlines Flight 77 struck the Pentagon..."

"The headquarters of the United States Department of Defense."

"The attack lasted only seconds."

"The questions that followed have lasted more than two decades."

"Tonight..."

"We examine one of the most debated locations in the entire September 11th investigation."

"Every generation remembers one day that changed everything."

"A day so extraordinary..."

"That people remember exactly where they were."

"What they were doing."

"Who they were with."

"On September 11th, 2001..."

"The world watched history unfold in real time."

"Sometimes..."

"The greatest mysteries aren't hidden underground..."

"Or locked inside secret government vaults."

"Sometimes..."

"They're written across the sky."

"Every day..."

"Thousands of aircraft crisscross the atmosphere above us."

"Most people barely notice."

"Others stop..."

"Look upward..."

"And ask a simple question."

"What are those white lines?"

"Every generation remembers exactly where they were..."

"When the world suddenly changed."

"For some..."

"It was the attack on Pearl Harbor."

"For others..."

"The fall of the Berlin Wall."

"Or September 11th."

"But in late 2019..."

"Another event quietly began..."

"An event that would touch nearly every person on Earth."

The Roswell Incident is one of the world's most famous conspiracy theories. In 1947, mysterious debris was found near Roswell, New Mexico. The U.S. Army first announced it had recovered a "flying disc," then quickly changed its story. Was it a secret military project or something not of this world? Join Professor Simmons as he explores the evidence, the witnesses, and the mystery behind Roswell.