World's Strangest Natural Wonders
Robert Harding Picture Library Ltd / Alamy
Sarisariñama Sinkholes, Venezuela
On the flat-topped mountain of Cerro Sarisariñama in southwest Venezuela, gravity has punched four perfectly circular holes nearly 1,000 feet deep into a landscape of remote rainforest. Hundreds of miles from the nearest road, the area is so far removed from civilization that the sinkholes weren’t discovered until 1961, when they were spotted by a pilot flying over the mountain.