Mental Floss

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Vienna’s Wienflussportal, showing the spot where the Vienna River emerges from its underground course.

Discover the hidden rivers buried beneath cities around the world. From Moscow to Tokyo, explore the history and modern efforts to reopen these forgotten waterways.

Julie Fogerson
The 1960s gave us a lot of marvy slang still in use today.

Discover the most iconic slang from the 1960s and how it shaped modern language. From 'flower power' to 'groovy,' these terms are the linguistic legacy of the decade.

Jake Rossen