Used for water distribution, the Delaware Aqueduct in New York, USA is the longest tunnel in the world (as of 2010). Drilled through solid rock, it reaches a staggering 137 kilometres (85 miles) in length. More tunnel facts.

Ten percent of the Russian government's income comes from the sale ofvodka.

Mount Olympus Mons on Mars is three times the size of Mount Everest.

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