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Guaira Falls

Don't go chasing waterfalls, they said. But the world didn't listen. The glorious falls of Guaira were once on the border of Paraguay and Brazil. But if you'll go there now, you will find that there's no longer anything to be seen. The waterfalls used to churn out 13 million gallons of water a second and could be heard from 20 miles away. But that all changed in 1982 when they were flooded to create a reservoir.

Calle Hesslefors / Ullstein Bild / Getty Images

Once a popular tourist attraction, they were submerged to make an artificial lake when the Itaipu dam was completed. There still are plenty of other water attractions out there, but we can't deny this is a loss.