Around 2,000 people are vying to win 1 million euros (USD 1.1 million) offered by a German city to anyone who can deliver solid proof it doesn't exist.
Officials in Bielefeld announced the competition last month, saying that there are "no limits to creativity" but only incontrovertible evidence will be rewarded.
The idea that the western city doesn't exist was first floated by computer expert Achim Held, who posted the satirical claim online in 1994 to poke fun at internet conspiracy theories.
Still, the "Bielefeld conspiracy" has become enduringly popular, prompting even Chancellor Angela Merkel once to jokingly cast doubt on Bielefeld's existence.
The city's marketing agency said Wednesday it received more than 2,000 emails by Tuesday night's deadline, around 300 from abroad. It will announce a result September 17.
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