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And while Alexander Graham Bell, born in Edinburgh but working in the United States, is credited with inventing the telephone, his work followed decades of work by others, such as Italian Antonio Meucco and the 1,200-year-old acoustic telephone technology from the Chimu Culture of Peru, stored at the National Museum of the American Indian in Washington.

The skeletons were found in a small space measuring 10 sq m in what was once the capital of the Chimú empire.

The Chimú ruled parts of present-day Peru.

Experts think that the mass grave may have been a burial place where members of the Chimú elite were laid to rest.

According to Ms Cueva, the later shows that the Chimú handled and moved the remains of their loved ones.