Bizarre Mysteries That Remain Unsolved to This Day

Mohenjo Daro

This UNESCO World Heritage Site was once home to an ancient civilization that emerged around 4,500 years ago. Mohenjo Daro was discovered in 1911, and excavations didn't begin for a decade. The city was equipped with advanced drainage systems and grid-style construction, but the fate of its inhabitants remains a mystery.

The More You Know

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The first commercial airplane flight lasted 23 minutes.
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Post originally appeared on Upbeat News.