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This is part two of a two-part Horizon series about the mystery of Easter Island, the stone statues, and the civilization that erected them.

On a winter night in 373 BC, the classical Greek city of Helike was destroyed by a massive earthquake and tidal wave. The entire city and all its inhabitants were lost beneath the sea. What has bewitched archaeologists about Helike is that it was engulfed just when ancient Greece was reaching its height; when the philosophy and art that inspired the western world for thousands of years were invented.

Horizon puts Graham Hancock's controversial theories about the past to the test, dissecting his evidence for a lost civilisation. Although scientists believe they have categorically disproved the myth of Atlantis, the idea is more popular now than ever before. The latest exponent of the theory of a single lost source for all civilisation, is Graham Hancock. Although he doesn't call it Atlantis, his compelling ideas about a sophisticated society destroyed in a flood 12,000 years ago seem to be based on a reworking of the original Atlantis myth, whose survivors brought culture, religion, monument-building and civilisation to the rest of the world. Divers at the Yonaguni formation It considers the idea that either Antarctica or an extraordinary underwater site at Yonaguni in Japan were the original home of these vanished people. In a film full of contentious debate and powerful arguments, Graham Hancock's claims are pitted against cutting edge scientific analysis to discover whether his popular theory could be true.

A remarkable find in the Northern Territory, Australia, has opened a fierce debate on the prehistory of humans. The date of the find, if correct, dramatically pushes back the date at which people began to create art and language, and triples the date of occupation of Australia. It is, however, strongly contended... Enormous sculpted boulders, described by Australian scientists Richard Fullagar and Paul Tacon as similar in concept to Stonehenge, and thousands of detailed circular engravings have been dated by them at around 75,000 years old, with stone tools dating back to 176,000 years. It seems that human evolution has many more unanswered questions than we previously thought...

It's been called the most important piece of film evidence of all time. Locked away in the vaults of the National Archives, the original Zapruder film that captured the vital 11 seconds of President John F Kennedy's assassination sits tattered and untouchable. Using exclusive eyewitness testimony, as well as newly restored, and in some cases, never-before-seen images of the shooting JFK: The Lost Bullet is a one-off special which investigates the assassination. For nearly 50 years experts have poured over crude copies of this extraordinary film for clues as to what really took place in Dallas on November 22, 1963. The film, in its myriad and often clandestine incarnations, has been presented as conclusive evidence to support just about every conceivable theory of the assassination.

On November 22, 1963, an obscure businessman - Abraham Zapruder - took his 8mm camera to a local park and shot a 26-second home movie. That film, capturing the assassination of President Kennedy, is arguably the most important film of the 20th Century. But did you know there were a dozen other photographers who trained their cameras on the Presidential motorcade? Join the Unsolved History team as they piece together those stills and flickering images to form a complete picture of the tragic events that unfolded in Dallas. Hear from many of the original photographers as they describe their unique viewing angle of the motorcade and the assassination. Follow them as they visit Dealey Plaza, some of them for the first time since that fateful day. Watch as the investigation team recreates some of the original photography to ascertain how modern methods might be better able to eliminate many of the conspiracy theories. Finally, observe as the investigative team uses all available film from that historic moment to assemble a seamless, celluloid timeline documenting the Presidential motorcade - from the jubilant entry into Dealey Plaza, to the tragic, final moments that forever changed the fabric of America's culture.

No other murder in history has produced as much speculation as the assassination of John F. Kennedy on November 22, 1963, in Dallas, Texas. Forty years later more than 80% of Americans still believe there was a conspiracy to kill the President and that Lee Harvey Oswald did not act alone. Peter Jennings Reporting – The Kennedy Assassination: Beyond Conspiracy attempts to separate fact from conspiracy theories to get to the truth. Beyond Conspiracy employs stunning forensic technology that makes it possible for the first time to be an eyewitness to this crime of the century – to see precisely what happened that November day in Dallas. Award-winning animator Dale Myers spent the last decade creating a computer-generated reconstruction of the assassination based on maps, blueprints, physical measurements, over 500 photographs, the Zapruder film and crime-lab and autopsy reports. His work was independently evaluated and given the highest marks by the foremost practitioners of this type of forensic analysis. Myers reconstruction brings viewers as close as anyone could come to actually being in Dealey Plaza on November 22, 1963. Beyond Conspiracy producers conducted extensive interviews with more than 70 friends and family of both Oswald and his killer, Jack Ruby; former officials from the CIA, FBI, Russian KGB, and the Dallas Police; members of the Kennedy and Johnson administrations; and participants in the various official investigations, including the Warren Commission. The program makes use of many of the more than four million documents relating to the assassination that have been released in just the last few years. Beyond Conspiracy is a program that counters speculation and theory with rational conclusions based on hard evidence as it examines a tragedy that still haunts the American psyche.

Through detailed examination of archeological and forensic evidence, existing photographs, authentic artifacts, and carefully selected interviews from eyewitnesses and experts - events are reconstructed and historical questions are finally answered. Join the investigators of Unsolved History for a final, definitive look at the assassination of President Kennedy in this special, extended episode. After 40 years of heated debates and accusations, the physical evidence that remains from that day in Dallas is all that can be objectively examined. Watch as experts scrutinize film footage and authentic photos taken the day of the assassination for uncovered clues. The alleged assassin's timeline is broken down to the nearest minute to show where he was at the time of the shooting - and whether or not the "accepted" version of Oswald's plot holds true. Listen in on an obscure audio recording that may shed light on the identity of the true triggerman and examine Exhibit #399 - the so-called "magic bullet," the most controversial piece of evidence. It's an in-depth examination of the unanswered questions, conspiracy theories and physical evidence behind the shots that changed history.

Fifty years later, what can science tell us about the Kennedy assassination—and the investigations that followed? The 1963 murder, in broad daylight in front of hundreds of witnesses, might seem to be a homicide investigator's best-case scenario. Yet somehow the JFK assassination became a forensic nightmare, plagued by a controversial autopsy and, incredibly, a prime suspect murdered on live television while in police custody, before he could be tried. As a result, today millions of Americans suspect a conspiracy. Now, NOVA launches a fresh investigation into the physical evidence, using state-of-the-art forensics, including laser scanning, new ballistics tests, and a 3D digital reconstruction of the president's skull, all to try to solve the murder of the century.