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On the heels of World War II and as the Cold War began in earnest, both the United States and the Soviet Union recruitedÌýex-Nazi scientists,ÌýlikeÌýWernher von Braun who had relied on slave labor from concentration camps, to design Germany's V-2 rockets. The United States alone secured 88 ex-Nazi scientists during what was termed "Operation Paperclip" in order to learn more about Nazi Germany'sÌýpowerful weapons and technology. It's partly because of this secret operation that we now know about Hitler's extensive program.

A classic birthplaceÌýof conspiracies about fallen alien ships and little green men, Area 51 is shrouded in mystery. According to ex-government sources, this mysterious area of Nevada is mostly a test site for experimental military technology, like the super-fast SR-71 Blackbird airplane,Ìýand notÌýa secret extraterrestrial testing facility.ÌýWhich is still cool, given the planeÌýcan reach three times the speed of sound—even if aliens aren't involved. A , and even marked it on a map.

Bigfoot, or Sasquatch, is a long-rumored bipedal mammalÌýthat dwells in the wilderness of the Pacific Northwest. More simply, it's allegedly a hairy ape that walks around leaving behindÌýfootprints for people to find and appearingÌýin blurry photographs. The FBI in 1976 officially investigatedÌýunidentifiable hairs from The Dalles, Oregon, that people believed may have belonged to . The investigation—declassified in 2019—proved inconclusive, but that doesn't mean Bigfoot isn't still out there.

The designation of "Ultra" was given to the most secret projects and documents used by the government during World War II. In 1953, during the early yearsÌýof the cold war, Project MK-ULTRA was sanctioned as an ultra-secret project to develop drugs and other practices forÌýmind control of interrogated subjects.ÌýMany of its experiments happened on unwitting participants and were clearly illegal, leading to international controversy. This now-declassified government project has been tied to many conspiracy theories, but documents definitively point to experiments around and .

During the Cold War, the U.S. intervened in many foreign countries to prevent the spread of Communism. Government bureaucrats worried about the domino effect, whereby if one country fell to Communism, all the other countries in the area would also be likely to revolt. Fidel Castro, who led Cuba into a Communist revolution despite having relatively fewÌýresources and people,Ìýwas no ally to the CIA. But declassified documentsÌýreveal that the CIA even went so far as to negotiate with mobsters to put out a hit on the dictator, hoping to install a more U.S.-friendly leader of the nearby island.Ìý

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Originally rejected from the military for being too tall (sheÌýwas 6'2"), Julia McWilliams joined the Office of Strategic Services in 1942 and quickly worked her way up the ranks. Known today for her wit, television shows, and her introduction of French cuisine to Americans, in declassified documents. Among her accomplishments? Helping to formulate an effective shark repellant for divers.

Thanks to the , records emerged around the FBI's extensive investigation of John Lennon in the early 1970s. The FBIÌýsuspected Lennon would disrupt proceedings in the 1972 presidential election, where Nixon hoped to be reelected,Ìýwith a planned tour complete with voter registration efforts and antiwar protests. To help stop him, the Immigration and Nationalization Service, which would later be absorbed into the Department of Homeland Security, began deportation proceedings against Lennon. It appears that their preemptive efforts worked; Lennon never did the tour, and Nixon was reelected.

In today's era of end-to-end encryption, secure digital back-channels, and disappearing text messages, it's easy to forget the CIA's spy work that went far beyondÌýwiretappingÌýphone linesÌýand buggingÌýmeeting places of persons of interest. The agency had apparently figured out a way to open sealed envelopes without detection, according toÌý about procedures for examining mail without leaving a trace. The CIA also detailed formulas for invisible ink.

Desperate to gain an edge over the Soviets in any way possible, the United States built a state-of-the-art, underground, nuclear-powered research facility called Camp Century in the remote tundra of Greenland. The U.S. toured this facility to the press; what they didn't mention was Project Iceworm, the plan to build 2,500 miles of tunnelsÌýunderneath the ice sheet that would be used to shuttle nuclear missiles back and forth, evading Soviet attempts to destroy them. Over time, the project was canceled and Camp Century itself was abandoned; now, with Greenland's ice melting due to climate change, scientists have raised concerns about the Ìýeventually returning to the surface.

Argentina's military dictatorship of the 1970s was marked by distrust, disappearances, and a murky relationship with the United States. But revealed that the regime was just as deadly as suspected——even employing assassination squads to eliminate enemies, many of whom disappeared without a trace.ÌýNow we know they were murdered by the Argentinian state and its assassins, who clocked in at 9:30 a.m.Ìýand even submitted expense reports.Ìý

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In one of the darkest moments of American military history, U.S. military forces opened fire on the citizens of My Lai, a small hamlet in Vietnam, killing hundreds of civilians (mostly women, children, and old men). The savagery included sexual assault and the eventual destruction of the village. More than a year passed before Cleveland'sÌýPlain DealerÌýnewspaper , revealing the massacre to the world.ÌýA declassified government report Americans wrought against the VietnameseÌýand the government's process in inquiring about the events that took place.Ìý

The United States in 1970 Ìýbound for New Mexico, according to declassified reports. The rocketÌýlanded in the Mapimi desert in Mexico by accident. Cleanup was long and extensive, partially due to the fact that the missile contained cobalt 57, a radioactive isotope that turns ordinary explosives into "salted bombs"—thankfullyÌýMexico recognized it as a mistake, and was willing to assist search efforts for the bomb.Ìý

The Soviet Union in 1967 offered tours of itsÌýLunik and Sputnik models, both advanced satellites integral to the Soviet space program. Unbeknownst to the Soviets, Ìýto gather information on its inner workingsÌýand returned it before anyone noticed. The operatives later wrote about the unofficial loanerÌýin an internal CIA journal to debrief—or maybe brag to—the rest of the agency.

While caught up in the Six-Day War, Israel in 1967 attacked the warship USS Liberty, exacerbatingÌýtensions between the U.S.—neutral in the conflict—andÌýother Middle East states. But declassified documents revealed that communication errors fromÌýIsrael and the U.S.Ìýwere , though some former soldiers maintain that the attack was deliberate.

The U.S. military tested 23 nuclear explosive devices in the tiny island system of Bikini Atoll between 1946 (the year after the bombings of Nagasaki and Hiroshima) and 1958, after relocating the islands'Ìýoriginal inhabitants elsewhere. Expanded materials about the Bikini Atoll nuclear tests Ìýin 2016. Among them were details about the extreme radiation contamination that took place, as well as video footage of the infamous mushroom clouds.

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The CIA had a hand in many different aspects of the Cold War crisis, including the distribution of the then-banned book "" throughout the Soviet Union. Penned by revered Russian writer Boris Pasternak, theÌýclassic novel was judged to have "great propaganda value" in its timeÌýand even won Pasternak a Nobel Prize in Literature, further embarrassing the Soviet government that had refused to publish it. More thanÌýÌýbehind the Iron CurtainÌýduring the Cold War.Ìý

Permanent human settlements on other planetary bodies have long been a staple of science fiction, precipitated by curiosity, a desire for colonization, or even the destruction of the Earth itself. Here, reality almost mirrored the fiction: Declassified plans reveal that America in 1960. The study included details such as what equipment was needed for setup and which contractors would support the project, Boeing among them.

Documents declassified in 1983 reveal that the U.S. government tested the idea of , implanting recording equipment in their bodies and letting them loose near the Kremlin or Soviet embassy. Millions of invested dollars later, the program was shut down.ÌýAlthough the cats could travel short distances successfully, the training was insufficient for the CIA's complicated eavesdropping needs.Ìý

The expedition that uncovered theÌýsunken remains of the RMS Titanic was sponsored by the U.S. Navy. As declassified documents reveal, the Navy was actually looking forÌýsunken 1960s ships USS Scorpion and the USS Thresher and their nuclear payloads. —and bonus discovery.Ìý

Americans were shocked to learn that the Soviet Union had launched a satellite into space in 1957. This achievement marked the beginning of the Space Race and the first of many victories for the Soviet Union, including sending Yuri Gagarin to be the first human in space. Though the public was unaware of the Soviet Union's otherworldly ambitions, the American government and its intelligence community were already in the know about Sputnik.

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Declassified documents from Great Britain show that the 1989 ,Ìýnot the oft-cited number of 3,000, and much higher than the Chinese government's own tally that puts the mark between 200 and 300. The secret diplomatic cable was written slightly more than 24 hours after the event took place.

Declassified records have revealed that , a cleric who would later emerge as a driving force in Islamic fundamentalism, was much closer to the American governmentÌýthan previously thought. Khomeini had sought to negotiate with the Kennedy and Carter administrations in order to ease his takeover of Iran, despite his public anti-American rhetoric, going as far as to call America "the Great Satan."

Winston Churchill was not interested in deciding the fates of Adolf Hitler andÌýother Nazi leaders in a court of law. ReferringÌýto Hitler as the "mainspring of evil," declassified documents reveal that Churchill in opposition to Allied plans for war crimes trials. Churchill must have relented, as the remaining Nazi leaders were subjected to the Nuremberg Trials starting in 1945. Hitler and Goebbels, among others, killed himself shortly before the end of the war to avoid capture.Ìý

The CIA's Corona project Ìýbetween 1959 and 1972. Originally used for military intelligence,Ìýthe pictures have since been declassified. Now, they've proven to be of great use to archeologists studying the region; the scientists can track changes over time to historically important sites.

Declassified documents have revealed that the U.S. government,Ìýout of fear of an invasion of Alaska by Soviet paratroopers,Ìý. Newly minted spies, many of whom previously worked jobs as fishermen and trappers,Ìýkept the government informed of Soviet movements. Project Washtub, as it was known, was active between 1951 and 1959, though the Soviets never attempted to capture Russia back after its purchase by the U.S. in 1867.Ìý

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In 1983, a Soviet Union soldier named Stanislav PetrovÌýopted not to fire nuclear missiles when it appeared that the United States had launched five missiles at his country. He had judged correctly that it was a false alarm,Ìýthereby averting a third and possibly final nuclear World War.ÌýThe world learned of his clear-headed judgment in .

The Dunblane Massacre was a tragicÌýschool shooting in 1996 that killed 16 children and one teacherÌýat a primary school in Scotland. Declassified documents confirmÌýthe shooter had in the past been reprimanded for inappropriate behavior around children, though criminal charges were never brought. There have also been allegations of media management to Ìýon these complaints.

When the telephone calls of President Lyndon B. Johnson were declassified, it was revealed that then-candidate . South Vietnam withdrew from the Paris Peace talks after being told that Nixon would get them a better dealÌýonce elected. Nixon was concerned that an early end to the war would derail his election campaign, since the Vietnam war was a pressing campaign issue. Nixon ended up winning the election by less than 1% of the popular vote.Ìý

Col. Oleg Penkovsky was a Russian double agent who regularly supplied information to MI6 and the CIA. Declassified documents reveal that it was his information gatheringÌýwithin Russia and abroad that alerted America to the , thereby kickstarting the Cuban Missile Crisis.Ìý

During the Cold War, the American army base in Thule, Greenland, was patrolled continuously by planes armed with nuclear missiles. After one of the planes went down, the public believed every bomb therein had been accounted for. Declassified documents revealedÌýthat one nuclear bomb was in fact never found. While that may sound scary on its own, Ìýare frighteningly common.

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