Since its discovery on Easter morning in 1722, this tiny Pacific island has remained a fascinating puzzle. It is the most isolated inhabited land on earth, and yet it was also home to a glorious stone culture. Can the mystery of its giant statues ever be solved? Who built them, how and why - and what happened to the civilisation that once flourished there? From all over the world scientists are drawn to this lonely spot, in search of answers.
In the first of a two-part investigation, "Horizon" pieces together the clues that can reveal the secrets of a vanished past.
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