Rio Secreto, Mayan Riviera, Mexico (PriceTravel pictures Flickr)
Rio Secreto, Mayan Riviera, Mexico (PriceTravel pictures Flickr) A cenote is a ?natural pit, or sinkhole, resulting from the collapse of limestone bedrock that exposes groundwater underneath.? Yes, and looks alien!
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Perito Moreno Glacier, Argentina: Unlike most glaciers around the world, it?s advancing, not retreating (Diego Delso Flickr)
Perito Moreno Glacier, Argentina: Unlike most glaciers around the world, it?s advancing, not retreating (Diego Delso Flickr)
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Mount Bromo, East Java, Indonesia: It?s an active volcano, check local notices before hiking there! (Victor Iniesta Flickr)
Mount Bromo, East Java, Indonesia: It?s an active volcano, check local notices before hiking there! (Victor Iniesta Flickr)
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Kirkjufellsfoss, West Region, Iceland (Adres Nieto Porras Flickr)
Kirkjufellsfoss, West Region, Iceland (Adres Nieto Porras Flickr)