High in the Andes, where the air is thin and the light feels almost metallic, lies a lake that has inspired stories for centuries.
Lake Titicaca stretches across the border of Bolivia and Peru, a vast inland sea more than 12,000 feet above sea level.
On calm days it looks endless, a mirror of blue sky ringed by snowcapped peaks.
Beneath its surface, many believe, an ancient city still rests.

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